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3D Printing - Science topic

Explore the latest questions and answers in 3D Printing, and find 3D Printing experts.
Questions related to 3D Printing
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Hello everyone,
I am trying to generate an algorithm that can roughly estimate the support's volume of an stl file at a specific orientation. Does anyone have any ideas where and how to start? I am trying to do this in Python but based on what I read, this can be a GPU computational and geometrical design problem. So I am not sure if Python is a good place to start. I appreciate any ideas/responses. Thank you.
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Hi I'm looking for co-authors to write a chapter of a book. In particular, the topic is “3D printing techniques and use in the Biotechnology laboratory“ maximum 20 pages.
I deal with direct communication with the publisher and with the revision of the chapter.
The deadline is for 22th November and the total cost is 350 GBP.
My direct contact is arnaudcapuzzo@gmail.com
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I sent you an email.
Keep in touch.
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I have Creality Ender 3 Max 3D printer. Please share the 3D printer STL file with me. It will help me to print . Beginner level.
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Dear Nekin,
You can downdoad free STL files from several websites such as Thingiverse, STLFinder, MyMiniFactory, GrabCAD and Cults.
I wish you good luck on this new journey.
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I try to 3D print a plate with the FDM technique using graphene infused PLA filament. The dimensions are as follows: Length × Breadth × Thickness = 5 × 5 × 2.5. Part fill style is in triangle, maintaining the bed temperature and melting temperature as 90°C and 180°C respectively (as recommended by the manufacturer). However, the plate isn't as precise as expected, which is a form of slightly curvy, (termed warping).
I kindly look after valuable suggestions from the 3D printing experts in helping me solving out this issue.
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PLA crystallizes above glass transition (ca 60°C). Crystalls have higher density and the material shrinks, causing the warping. Plus the graphene filling may cause adhesion issues because it is hydrophobic. I suggest doing the following steps (all of them):
1) decrease the bed temperature to ca 50-55C
2) increase the hot-end temparature to 200C or more
3) use some adhesive to improve the adhesion
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Greetings, I have conductive graphene PLA filament for 3D printing. Before approaching printing, I need to conduct a TGA analysis of the material, for which the material only in powder form is feasible. How may I convert the available filament into powder form? Kindly help me provide your valuable solution.
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freeze, crush and sieve
Or spot for milling of pigments.
What kind of eqipment do you have?
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I need to create TPU/3wt% CNT filament for 3D printing. With my current filament, I am unable to print, the extruder is moving but nothing is coming out from the nozzle.
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Hi, the quick answer would be a twin-screw extruder. Other options are mentioned in the reference kindly provided by Mohammed Hussein j. H. Al'Atia above; however, the overview there is very brief.
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I am a beginner of SCAD modeling.
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Maybe,
get familiar with the standard boat test?
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Facing trouble (bonding-leakage) while using hand-pressure to pass liquid through my microfluidics device. I used UVO-cleaning instead of plasma-bonding (PB not available).
The way I cleaned the glass slide before UVO step: H2SO4 (70%) Overnight> dH2O > Soak with Methanol (~100%) > IPA (~100) > also add Acetone (~100) sometimes > UVO-treatment.
Microfluidics Channel precision = 20 um
PDMS (10:1)
Glass slide = Microscope cover slip 25*45mm
Please let me know if you need more clarification.
Thank you for your suggestion.
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I have not tried UVO cleaning. I found that typical microscope slides are problematic. We use Corning Incorporated micro slides (2947-75x50) at my lab. We clean the slides before hand with 2% dawn detergent (spray bottle), rinse thoroughly with tap water, then deionized water and finally with isopropanol. The slides are then dry under nitrogen and not touched with bare hands. We functionalize the PDMS and slide surfaces in a Harrick plasma generator for 30-90 seconds.
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Hello,
I am trying to simulate a laser path to understand various mechanical effects because of using a DED to build a cube of 15mm*15mm*15mm in ANSYS workbench using DED Process extension(attached) for Tungsten.
The extension enables Transient thermal followed by static structural, although I am not sure how to set up the process. I could not find any leads on the ansys on the setup unlike for the moving heat source (many sources available)... I was wondering if anyone can share how to enable the process.
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I am also trying to incorporate the laser in the ansys..but it's very difficult to find any source
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I am trying to create a 0.1mm thick PDMS layer on a 3D printed mold (made from photopolymer resin of B9 creator). Although the PDMS layer is curing, I am finding it difficult to peel the thin layer. I apply a release spray on the surface of the mold before proceeding with spincoating the PDMS layer. What methods can be done in order to obtain such thin thicknesses? What release agents can be used or reagents that can help in the liftoff process of the PDMS layer?
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Hey Ankitha,
I am following the same issue. Were you able to find any viable solution for this problem?
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Please suggest me some python code for 3D printing project
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It’s my pleasure
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I saw literature that frontal polymerization can be used in 3D printing of composites. The curing can be triggered briefly by external heat source, and the thermal front wave can travel from the external heat source side to convert monomer to polymer. How to control the heat rate in composites curing?
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You may be interested by this reference: Gold nanoparticles are used to generate heat locally by photothermal effect and cure PDMS:
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Hello, I want to know how can SLA, DLP or other vat photopolymerization methods achieve multi-material printing capability? Can they print multiple materials in different regions at the same time?
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Industrial 3d printers capable of producing multi-materials components by vat photopolymerization have emerged in recent years. In general, they use multiple vats, each with a different material.
The following link from a supplier has some very helpful video and images to understand the process.
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I'm looking to develop a DoE using an I Optimal design for 3D printing process parameters. However, I'm looking at two Run parameters (I'm using the Design Expert software): "Lack-of-fit points" and "Replicate points".
By default, they both have a value of 5. But from my understanding, the "Replicate points" is a parameter that affects the optimality the more the points are replicated while "Lack-of-fit points" affects the relationship between the input factors and the responses.
Now, by increasing either by a factor of 1, the total runs of course increases also by a factor of 1.
Question:
However, in terms of the significance and other points that are generated during the Analytical stage, has there been any works that discuss the importance of these factors on the accuracy behind an I-Optimal DoE in the end? Surely, you wouldn't want to increase the points by a large amount, otherwise you might as well do a Full Factorial, haha!
Of course, I do understand that this question is indeed quite open ended because the outcome of what I'm asking hugely depends on the type of research being conducted.
Any info and advice would be greatly appreciated!
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Hi Ezekiel,
It's all a matter of how high you need the resolution of your DOE to be. For example, if you are having extremely high precision (low variance in replicates always) then there is barely a need to have elevated numbers of LOF/replicate points.
A more sophisticated approach is to check the Fraction of the Design Space (FDS) graph and see if the resolution for your purpose is sufficient after you have created the DOE. You can check this video from statease and make yourself familiar with FDS: https://www.youtube.com/watch?v=6CUa_n6ZEj4
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I want to make a composite by using 3D printing resin as a matrix. I am using solution casting method.
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Yes , read the paper (3D printing of polymer matrix composites: A review and prospective)
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Creating orthoses through 3D scanning and 3D printing, aiming to facilitate the integration of health professionals.
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3D scanning, additive manufacturing, and CAD/CAM software are applied during the development process.
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I'm conducting research on 3D printing concrete mix design. I have studied several papers related to this issue but I couldn't find any information about the role of the wooden part (shown in the attached photo) in the concrete printing process. I would be grateful if anyone can give some information about this issue.
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You are sure this is a wooden piece?
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Hello everyone,
I am trying to model the process stage (Gate to Gate) of FDM on SimaPro. I understand that I need to decide upon my inputs and outputs as well as system boundary before doing that. I am trying to do this properly and was wondering if anyone can advise more on this methodology (i.e., how to decide upon the values for the raw material input and electricity?, etc...).
Any response is very much appreciated. Thank you.
Useful Article: Methodology for systematic analysis and improvement of manufacturing unit process life-cycle inventory (UPLCI) —CO2PE! initiative (cooperative effort on process emissions in manufacturing). Part 1: Methodology description.
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For FDM SimaPro modelling in gate-to-gate first you should have clear system boundaries based on the research scope. I would like to suggest the following research articles for in-depth study:
Hope them helps you
Best regards,
Shuraik
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Hi,
I am looking for a device to apply a controlled force on soft hydrogels (a few kPa) in solution while imaging with an inverted microscope. Preferably something that has been documented in the literature and can be reproduced using e.g., 3d printing?... I could not find anything like this, mainly stretchers which allow for the application of a controlled strain but not a controlled force.
Ideally the material should appear in the filed of view without being disturbed by the device - perhaps something like a tensile tester?
Thank you in advance!
Giuseppe
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Hi Rory Gibney , thanks for the suggestion.
This was in the options I was thinking of, we actually have a Chiaro nanoindenter in the lab and would not be too difficult to move it on the microscope I need to use. We actually wrote a JoVE protocol on the Optics 11 nanoindenters: https://eprints.gla.ac.uk/261066/2/261066.pdf :)
I was thinking of something easier - not necessarily a commercial instrument - maybe something that can compress / stretch the gel perpendicularly to the direction of imaging, while recording the force.
Giuseppe
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Dear all,
I have done a dynamic test on elastomer Agulus materials used for 3D printing to investigate the mechanical properties of this material, for instance, Storage and loss modulus, but the result is showing that the loss modulus is higher than the storage modulus, is this possible?
I attached both graphs, with the green coler being Loss modulus while the red is storage modulus.
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I agree with Ross James Friel. The storage modulus determines the solid character, while the loss modulus determines the liquid character of a polymer. When the storage modulus is too high, it is more difficult to break down the polymer, making it harder to run through a nozzle extruder. With a high loss modulus, the polymer is too liquid and may start to flow out of the nozzle, and not hold its shape very well. A polymer suitable for 3D printing should have a balance between these two moduli. Preference is given to polymers with a storage modulus greater than the loss modulus, as they provide a material that retains its shape while being extrudable.
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There are several tools to simulate 3D printing of metallic parts, but I wonder if there is any reliable molding tool to simulate 3D printing process of plastics.
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While doing heat treatment to SLM parts, Do we need to perform heat treatment along with the build plate or after removing parts (using wire cut EDM) from the build plate?
My main concern is to study the effect of heat treatment on mechanical properties and residual stresses
Can anyone explain this? (It will be helpful to my work if you provide an answer with the journal also)
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I invite you to check our paper, in which we compared the effect of stress relief with parts attached to the building platform on, among others, residual stress in laser powder bed fused IN718 alloy.
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Metal AM/3D Printing processes have seen massive R&D efforts over the last few years, which have helped improve the indsutrialisation efforts of AM processes. I would be very interested to hear everyone's thoughts on what the topics are, that need to be investigated and developed over the next 5 years by those in research.
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Actually, Powder Bed Fusion (PBF) is an advanced AM technology that has matured over an extended period of research and industrial development. This technology development has enabled wide uptake of commercial applications of PBF technology, particularly for the production of high-value products that are not technically feasible with traditionally manufacturing processes.
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Hi all, i would like to know what are some of the key considerations one has when it comes to purchasing metal powders for printing? Price point is definitely a consideration, how about quality? or even availability of powder sizes or availability of small batch like (10kg?) is that a challenge in purchase of powders? any other challenges when you face when it comes to purchasing metal powders?
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Actually, Metal powders used in AM processes are typically microscopic in size (< 100 µm) and often pose toxicity, reactivity, combustibility and instability hazards. Dust clouds, formed for example by the accidental swirling of powders, have the potential to catch fire and explode under certain conditions.
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Our last article - The Influence of Gravity on 3D Printing with the FFF/FDM Technique - Reverse FDM/FFF 3D Printing #flashforge Feel free to discuss under the article. What new possibilities do you see when using reverse printing? heat convection change, another way of bonding layers? faster printing? I am curious about your opinion. Often, simple questions do not have obvious answers and require an experiment that yields an unexpected answer. Have you ever wondered what will happen if you turn 180 degrees to the commonly accepted FDM printing convention? The paper presents the verification of the possibility of using the reverse orientation of the print head in traditionally used 3D printers of FFF/FDM systems. It has been shown that the mechanical parameters of the printed object can be even higher when reverse printing is used. The presented concept opens up new possibilities of designing printers in FFF/FDM systems, which use changed heat convection and the reverse effect of gravity on the printed object. This work was carried out using the TRIZ methodology.
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One thing we could imagine is to use reverse FDM to make a perfect bridging machine without supports:
In reverse printing the hot filament will fall in the direction of the head. It is theoretically possible to add a cool, flat, non-adhesive substrate (yes those are harsh conditions) to maintain the filament position long enough for it to cool down and solidify. Please look at the image i included to have a better idea of what i mean.
Although the engineering side is very challenging what is your take on this idea?
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Hello, I am doing research in ceramic 3D printing using stereolithography (SLA) method. I was wondering if there is any feature of photopolymer resin that make it not able or not safe to go through firing /sintering process. Thanks!
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I have not heard about a photopolymer resin that is not safe to go through the heating post-processing. However, SLA uses formulations with a high amount of organic materials, and therefore, the debinding must have adequate heating rates to avoid cracks.
The following paper presents an extensive list of photopolymers that have successfully been used in works related to ceramic vat photopolymerization (SLA and DLP).
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Most of the 3D printing resins are synthetic chemicals. Is there any biopolymers to replace resins. If so kindly share some lietrature and suggestion for using biopolymers for 3D printing
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Dear Sudhakar M.P , your definition of biopolymer is not clear. Biopolymers can be divided into bio-based polymers and biodegradable polymers. Bio-based polymers are produced from biosources and can be biodegradable or not, for example, starch or bio-based PE. Similarly, biodegradable polymers can be either bio-based or fossil-based, for example, PBAT is fossil-based while PLA is bio-based.
Now, come back to your questions, I think PLA has been used extensively in 3D printing and PLA is both bio-based and biodegradable.
Best regards,
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Dear Colleagues,
If you are researcher who is studying or already published on Industry 4.0 or digital transformation topic, what is your hottest issue in this field?
Your answers will guide us in linking the perceptions of experts with bibliometric analysis results.
Thanks in advance for your contribution.
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Hello ,
I am looking to 3D print a double network hydrogel (PAMPS/PDMAAm). I am having trouble calculating the quantities I require to 3D print an approximate 27cm3 volume of the model.
Products required:
For the first network, Monomer = AMPS (1 mol/L); Cross linker = MBAA (4 mol%); UV light initiator = 2-oxoglutaric acid (0.1 mol%)
For the second network, Monomer = DMAAm (2 mol/L); MBAA (0.01 mol%); UV light initiator = 2 oxoglutaric acid (0.03 mol%)
Could you please guide me in the process to calculate the amount of monomer, crosslinker and initiator required for the experiment?
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Sonali Shankar I havent worked on DN gel. But from my experience working with hydrogel fabrication. I take 0.1 wt% of photoinitiator ( 2 mg in 2 mL Di water) and dissolve my biopolymer in that solution - 10 mg/100 μL to get 10 wt% of polymer solution and use it for hydrogel fabrications. Calculate 1mol of AMPS using its MW and then MBAA is used 4 mol% (4 equivalent) and photoinitiator 0.1 mol%(0.1 equivalent).
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one of the FDM 3D printing parameters
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Hello,
"Line width defines the width of a single printed line, which should be close to the nozzle size. Based on the line width, the extrusion rate is adjusted, which means that it will automatically calculate how much material must be extruded."
From:
If you print with a 0.4 MM nozzle, you should use 0.4 MM as your line width. The documentation states "Decrease the line width slightly of the outer wall to allow sharper detail on the model." which would increase print quality.
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I am doing Stereolithography (SLA) 3D printing using ceramic slurry. I found some slurries could be UV cured, some slurries could not react to UV light. I found that refractive index could impact the curability of the slurry. Is there any equipment that test the refractive index of the slurry?
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Here you can find also a good proposition:
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I am interested in removing defects during metal LPBF like orientation adjustment, residual stresses, cracks, part failure, etc.
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For predictive simulation of these processes, we use Autodesk Netabb (https://www.autodesk.de/products/netfabb/features), which works great but is cost-intensive. We also use the Simulia Abaqus "AM Modeler" Plugin (https://info.simuleon.com/blog/using-abaqus-to-simulate-additive-manufacturing-printing-an-optimized-hip-implant) which costs less and also delivers good results for this process. These simulations might potentially help you to reduce the thermal and stress-induced defects and deformations in your parts. Further, it might support you to improve your support structure placement (if required for your process).
When considering micro-defects and the quality of the material after manufacturing, you should specify the type of defects that should be "removed". Maybe a simulation would not be appropriate and you should consider an In-Line process monitoring and control for your process, combined with a proper "Design of Experiments". The data achieved by this procedure could be used to improve the simulations mentioned above by considering your materials and machines constraints.
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As we all know the best particle size for SLM is around 40um.
I was looking for a lab scale machine to produce my needed metal powders and I found ATO Lab Atomizer machine, although the company claims that the output powder of the machine is suitable for SLM but in its catalogue it is mentioned that the particle sizes are between 20 and 120um.
I am curious to know can I use that powder for SLM AD?
and also how many percent of that powder is under 50um?!
they did not share any size distribution graph!
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Dear Mrs. Cheng,
As for ultrasonic atomization by itself, ultrasonic frequency is the most important factor. You could take o look at our new paper on technology.
You could also take a look at the PSD we have obtained at the rePowder device by AMAZEMET for two different frequencies. As the inventor of both the abovementioned devices, I would suggest taking an in-depth look at the material feedstock used by both setups.
Best regards,
Łukasz Żrodowski
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Hello everyone, I tried to export an .stl file of a 3D designed pipe adapter with threads in AutoCad 2022 Software, however, the threads were missing. I tried multiple times but all of my attempts failed. Any idea?
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Hi dear Mustafa Nile
Did you observe the following steps?
  1. Click Output > Send panel > Export. At the Command prompt, enter export.
  2. In the Export Data dialog box, enter a file name.
  3. Under Files of Type, select Lithography (*.stl). Click Save.
  4. Select one or more solid objects. All objects must be entirely within the positive XYZ octant of the world coordinate system (WCS). That is, their X, Y, and Z coordinates must be greater than zero. The file extension .stl is automatically appended to the file name.
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Using ultimaker cura I am using ultimaker CPE transparent for printing . How to optimize for its 3d printing and which type of parts can be made through it.
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105% -110% infill, hight reduction do 0.1mm or 0.05mm will do. The mainnapproach is to eliminate any air from print which cause internal reflections in structure. Then sand papeer up to 4000. You can also use metallographic polishing machine with low speeds. I did get transparent PLA prints with this method.
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DICON images will be used in health education, graduation and research projects in human anatomy (male urinary system). DICON images will be converted to 3D print files.
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Thank you Vjekoslav Kopačin . This is a great website.
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Could you provide a selection principle of resin species in order to increase cured depth for DLP ceramic slurrry? For example, the ratio of HDDA and PEGDA or any other resins.
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Hi Maohang, you could take UV spectra from different formulations and compare the absorption at the wavelength your 3D-printer uses to select for the formulation with the lowest absorption. Besides the resins you should also consider the other components of your formulation.
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Making Construction Industry as an Automation will reduce labor and Material cost. In 3D printing technology there is only minimum need for Men resource and others will not have jobs to perform.
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Yes, it would definitely affect employability, particularly in India, where a large number of people are economically challenged and have been engaged in the construction sector.
But a change would also come with many alternatives or it would drive further employment opportunities.
Thank you.
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Hi,
I need to use Poly(ethylene glycol) diacrylate - PEGDA for 3D printing and it's required to have have high viscosity. Would you please suggest me the suitable MW of PEGDA and where to buy it for 3D printing?
Thank you.
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Mn 250 PEGDA is the best for bioinspired 3D printing.
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I have been recently trying to cast and cure Sylgard in 3D printed master molds made of resin but the sylgard doesn't cure. I have tried to cure it at different temperatures but still it doesn't cure.
I wonder if anyone has ever had this problem before and how you could fix it.
Thank you.
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The best way to cure PDMS on SLA 3D printed structure is to post-cure your print for additional time and temp 80c for 3 hours or 150c for 15 mins (glass/Al plate). I used Pt/Fe based PDMS catalyst.
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What do people think is the most significant part of this research project ? Is it mainly about figuring out a way to print hollow structures with SLA and designed the printing process of a lung ?
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Perhaps it is a foundation for further research in the future? but it feels too simple now...
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I have tried to follow the paper about the blending of PEGDA and PEDOT:PSS to print with stereolithography. However, I haven't received the same CV as the paper does.
In brief, the PEGDA was a base matrix, BAPO was the PI, and 1% (w/w) PEDOT:PSS was the conducting filler. The mixture was exposed to UV for photopolymerization.
I have set up three-electrode system,
my polymer, printed from the blended polymers (3 mm diameter), as a working electrode, a platinum counter electrode, and an Ag/AgCl for the reference electrode.
I attached the CVs from my experiments here.
are there any suggestions to get the duck-shaped CV?
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Please see paper, Synthetic Metals 2012, 162 (13-14) 1308– 1314, Sensors and Actuators B 196 (2014) 357–369,If it's not clear, we'll discuss it.
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Except for the minimising contact between the metal and any sources of atomic hydrogen, what are all the other methods we can adopt while 3D printing (DED methods) stainless steels?
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Mohammed Hussein j. H. Al'Atia Thank you for your message!
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A dentist in our group is interested in doing virtual surgical planning and/or 3D printing based on 3D reconstructions of cone-beam computed tomography (CBCT) data. 
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3D Slicer is an open source software that can be used for 3D reconstruction. It can also be used for generating stl files. Meshmixer and viewbox - are good softwares for stl files
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I have some samples and I need to do heat treatment on them to release the residual stress after 3d printing and make better the ductility for the tensile test.
I heated them in a vacuum furnace with the 750-degree celsius for 2 hours.
As the container was graphite, we put a thin layer of Zironica powder under them. but the result was awful. as I am not familiar with metallurgy and this process too much, anybody can give me some advice and guidance on why it happened to my samples?
It seems, under the samples that are in the contact with the powder, has the blue color(dark blue), and another area is the yellowish color like gold and it seems, the shape of one of my samples changes because of heating.
this result is strange because the color changed in the vacuum furnace without any gas inside.
The first image is all samples after heating.
The second image is under one of the samples that have close contact with Zironica powder
(The white part is the Zironica powder that remained on the samples)
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The problem with heat treatment of titanium alloys is that this material oxidizes even at very low oxygen partial pressures. Even the best vacuum furnaces fail to prevent oxidation of elements such as titanium, aluminum, zirconium and vanadium, as you have seen. Oxidation of zirconium and aluminum always produces white oxides (your white powder that adheres to the samples). Titanium can form both white and blue oxide layers (blue oxide is formed at a low oxygen partial pressure), while vanadium forms yellow and brown oxides. All of these colors are present on your samples, which indicates a fairly intense oxidation of the samples in your vacuum oven.
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I'm following the instructions here to create a 3D printable bioink but after i freeze dry my samples, they only partially dissolve in water. I tried heating with a stir bar too and it would still not completely dissolve. In the paper, they describe their Sil-MA composite as a powder after freeze drying but my sample is more similar to a strong Styrofoam. I cannot grind it up with a mortar and pestle and cutting it is very difficult. I've had relative success dissolving it in formic acid but but i think the acidic environment hinders crosslinking so I'd perfer to use water as the solvent instead. Any ideas?
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Dear Kyle Printon, I think freeze drying has introduced denaturation of silk. My Regards
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Today, 3D printing is used in many fields. And the idea of using 3D printing to create objects in space is fascinating. But there are microgravity conditions in space. Many conventional 3D printing techniques cannot be used in this situation.
1- Which 3D printing techniques are more suitable for use in space?
2- What points should be considered for the idea of 3D printing in space?
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Laser assisted bioprinting can be used in micro-gravity environment I guess.
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PLA thin beams at three different infill orientation angles (0°, 45 °, 90 °)
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Hold the model by pressing right mouse button then rotate in the desired angle.
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How do you understand, by your experience the areas of application of 3D printing with the use of plastics (biopolymers)? Which areas of practical application are likely to become the fastest and achieve breakthrough value? I mean real industrial applications. I suggest maintenance (spare parts, consumables) as the direction. Machine spare parts can be printed without involving the supply chain. This applies to elastomeric elements, seals, shock absorbers, bearings, etc. The 3D printer can additionally secure the supply of critical spare parts that do not need to be kept in stock and can be restored in a short time.
What other directions of mass use of 3D printing in FDM / FFF technology (polymers) do you see for which research is worth doing?
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The future of bioprinting will be human organs fabrication
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Hello everyone
I use a metal powder as the filler to a thermoplastic polymer matrix. Therefore, I wonder if there are any changes such as the molecular weight distribution, occurring in the structure by adding the filler metal powder?
My regards.
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Dear,
Some pigments can cause property modifications. I have tested PLA with different colors, and they have different tensile strengths.
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Hi, I am working with PEGDA (polyethylene glycol diacrylate) for SLA 3D printing. Parts made from 100% PEGDA are transparent after production, while adding increasing amounts of propylene glycol to the pegda solution makes the final part appearing milky-white. Why does that happen? What causes this phenomenon? Please note that the liquid mixture of PEGDA/propylene glycol is also transparent before 3D printing.
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Dear Carlo: I beleive you have a phase separation problem. The refractive indexes of PEG and PEGDA are 1.4339 and 1.463, respectively. After the 3D printing process, small segregates of PEG are formed. These have to be larger than 300 nm, in order to cause light dispersion, that is milky appeareance.
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I studied journals on SLM (Selective Laser Melting) produced Al12Si components
In that many authors used Solution heat treatment/ annealing.
but for AlSi10Mg they used T6 heat treatment
why can't we use the same T6 for Al12Si?
Your answers help me a lot
Thanks in Advance
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Thank you for answering
What I understand from the above two answers is
by looking phase diagram, at AA temperature (150-1800 C), the solubility of Si in Aluminum gets zero but in Al10SiMg because of Mg content Si is not precipitated and forms Mg2Si
Correct me if I am wrong
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Hello all , Thanks in advance for reading my questions.
I purchased 3d printed filaments from these people https://worldoflilliputs.com/product/10-meter-ceramic-trial-pack/
the name they given for material is ceramic ( i am doing research in bioimplants i thought to use it ) but it is polymer. I started searching for literature nothing found , ceramic original composition , orginal 3d printing are poping up instead of this polymer. what sort of keywords need to be used to search for it . I enquired with the suppliers regarding combination of filament , they didnt responded. so I went on to EDX analysis , (I attach those as well) I couldnt able to understand how to think about the materail please do help .
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Dear Ranganath Lolla, please find interesting documents in the following google search link, with the keyword I understood from the question. My Regards
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Ref.
3D printing of high-strength aluminium alloys
In this paper, the authors mentioned using electrostatic assembly technique to coat Al alloy micro powder with ZrH2 nanoparticles. How do they implement this technique? What kind of equipment do they use?
And what is the advantages of this technique compared to mixing particles via ball milling, ultrasonic/magnetic stir, etc.?
Thanks,
Xing
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Why not directly send an email to the authors? /Kai
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I have the file in Pymol for example or as a PDB image . Can someone provide a guideline how this can be converted for 3D printing ? Thanks in advance
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Hi Ivan,
I learnt that this was quite difficult using Pymol, however, using Chimera (I use version 1.14) this task became rather simple!
  1. Download UCSF Chimera for free at their website. It's a small simple program similar to Pymol, even though I normally prefer Pymol over Chimera.
  2. From Chimera's starting interface, you can directly fetch any PDB structure (other databases are also available), or you can choose your own local .pdb/.cif (or similar) files.
  3. Then in the "Actions" menu, you choose whether Atom/Bonds, Ribbon, Surface should be hidden or shown. For standard ABS printing, I found that surface models worked the best.
  4. When you are happy with the result, click on "File" → "Export scene" and choose file type STL. Then all you need to do is to run this STL file through a slicer and export to your printing device.
Hope this will help you.
Best of luck!
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I designed and made a rotary atomizer with the help of 3D printing. Now, in order to evaluate its performance, I want to measure the diameter of the produced droplets. According to mathematical calculations and theory, the diameter of the droplets is about 100 microns and I want to measure the diameter experimentally.
Please help me in this way how to experimentally measure the diameter of a drop that is produced continuously.
Best regards,
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I think the most straightforward (and intuitive) way is what Amit suggests. A good imaging setup (bright light source, and good contrast) will resolve the problem. Regarding the distribution, the image processing of the captured images (depending on your image quality, it may be super easy or super difficult) provides you with the distribution of the droplets. I use a similar procedure for measuring the diameter and distribution of bubbles departing from a boiling surface.
Thanks,
Shayan
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I'm going to work on a project that automatically removes support layers in 3D printing. Is it possible?
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If you are going to use PVA as support material, it is mandatory to use the dual-head printer. Otherwise, you can't really switch between the 2 materials while printing it... The best solution is to design the object within the limits, such as 30-degree inclination...
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Hi all.
I want to make polymer composite ink for 3d printing(Extrusion method).
so, I need a polymer matrix that has low melting point(~100 C, low is better)
And also it should have low viscosity for easy mixing with other material.
Is there any polymer candidate you could recommend for me?
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Despite the dramatic development in the digital manufacturing technologies in the recent years, 3D printing of earth materials, such as cob, still faces several challenges to be adopted widely on an industrial level, specially when compared to 3D concrete printing. There have been increasing efforts in the recent years to improve the applicability/ feasibility of 3DP earth materials in construction, however, the progress is still slow and scattered. Hence, I am wondering, how do the research community perceive the future of the 3DP of earth-based materials in construction.
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Thanks Steve. Yes, this work aligns with my PhD research. I am glad to see more institutions are considering this fusion between digital technologies and earthen materials.
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Absorption peaks of most photoinitiators are below 400nm. So why do most DLP 3D-printing machince use 405 nm wavelength?
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Hello Maohang Zhang,
as far as I learned up to now:
All LCP based printers use 405 nm because the LCDs absorb too much power below this wavelength. They already absorb a lot of power at 405 nm, by the way.
A lot of DLPs use 405 nm, too, because the optics for 405 nm are made of plastics and are quite cheap. Optics for lower wavelength are more expensive. But from my point of view, there are several DLP printers that can be ordered with different wavelength than 405 nm.
And: Cheap printers state to be DLP printers but state to use an LCD, so they are no DLP printers from my point of view.
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In terms of material bio-compatibility with human eye, which material and 3d printing process is suitable for printing a mold at which a cornea is made by collagen and stem cell growth?
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I understand there are a lot of software programs that can simulate DED by going through specific modeling, simulation, and commands. For me, that was time consuming and results were not accurate. I am asking if there is a specific software that already has the DED process included.
For example, I have found some programs that come automatically equipped with modules/wizards to directly simulate FDM and PBF. However, I was not able to find one the has a module/wizard to directly simulate a DED process.
Any advice would be greatly appreciated!
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The following software is capable to make simulations for the Direct energy deposition (DED) process :
1. Autodesk Netfabb (Ultimate version), https://www.youtube.com/watch?v=E4WM6eSdPlo
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Advanced Manufacturing-3D printing-paradigm shift -social impacts
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Since the 1980s when Chuck Hull proposed 3D printing, there has been a change in way of building.
Additive manufacturing, so well known to mankind, has earned ally of 3D printing (3D printing is additive manufacturing, but additive manufacturing is not just 3D printing).
The advances come from possibility of building parts, and items that Subtractive and Formative Manufacturing are unable to meet.
The manufactures complement each other and one manages to do what the other does not.
The paradigm shift has been taking place in last 40 years, with more force from 2010 to the present day. See new machines, new materials, new ideas!
The impact on society starts in manufacturing process in Additive Manufacturing, which is insertion of material (raw material) to make the object, without wasting material. This is significant for product cost, environment and nature.
Additive Manufacturing contributes to more agile solutions and prototyping with reduced cost. This directly impacts the cost of developing a product and thus its final cost.
I hope I contributed to your discussion.
Regards,
Wiltgen
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If we will fabricate 49Ni-51Ti and want to train the product to actuate at 40C , then how we will follow the procedure in 3D printing?
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I'm trying to make some 3D printed microfluidic chambers on glass slides by using fused deposition modeling and printing directly on the glass. The problem of course is that due to differences in thermal expansion/contraction, the PLA falls off as soon as the glass/PLA interface cools due to thermal stresses. I've tried typical adhesives for printing like hairspray, etc. but these only really give a temporary bond until the material cools.
Are there any sprayable adhesives that could easily bond glass to PLA that I could use in a step by step mask method (printing the inside of the microfluidic chamber, spray the adhesive, remove the inside, print the outside chamber, etc.)?
Is there another way to get this to occur? I thought about poly-l-lysine treated glass as well, but I haven't had a chance to try that yet.
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I used silicone, the cold one (the one used for glass, mainly in showers and windows). It worked like a charm (also, I designed mi pla housing with some small tabs so I could make a better adjustment for the glass). If you have any doubts towards how to use it, just ask! Ill be happy to help.
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I am working on a project on designing and testing new materials and different structure(3D-infill) configurations as prototypes for the mid-sole of a running shoe.
I was wondering about the functional properties that would be required from the mid-sole of a shoe to optimize its performance.
Any leads regarding mechanical/functional properties of running shoes, midsoles or regarding mechanical testing of midsoles would be very helpful.
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weight acting capacity, stiffness, material, strength etc.
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Could you recommend some good exemplary papers on the successful adoption and scaling up of emerging technologies (e.g. AI, IOTs, VR, 3D printing etc.) in different organisational contexts? Particularly interested in health services but other contexts as well.
I find many existing approaches - such as social shaping and/or construction of technologies, or TAM etc unsatisfactory, particularly when communicating with practitioners or recommending practical solutions.
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Hello Feng Li ,
To improve the adoption and scaling up of emerging technologies (e.g. AI, IOTs, VR, 3D printing, etc.), one strategy will be collaborative research between academia and industry.
The adoption of disruptive technologies is largely socially constructed and constitutes a quintessential example of innovation diffusion. So, the acceptance of the emerging technologies by practitioners will depend on the additional utility or value that can be derived viz-a-viz existing technologies. This means that we are better able to improve the adoption and scaling up of emerging technologies if we can provide a justifiable, verifiable, and evidence-based assessment of the value-added benefits of these technologies.
A collaboration between academia and industry in researching the value-added benefits and costs of these emerging technologies is crucial because it will provide a participatory paradigm in verifying the benefits and costs. Such an approach will reduce the additional commitment required to explain the findings to the industry practitioners.
In summary, if we can scientifically and practically prove the value-added benefits (especially monetary benefits of the intangible and soft improvements) of these technologies and explain them to practitioners in simple languages, we may be able to improve and scale up the technologies.
Hope this helps!
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Dear all,
i have found lots of books on additive manufactuting but very few lecture notes (ppt) files.
I am doing a 3d printing project as my thesis and have to present the historical background etc. I surely am not looking for copying stuff from other ppt's but seeing different versions will surely give me a broad idea for presentation.
I have also read books about additive manufactring but seeing the most common topics valuable for a presentation would ease my work for the first slides of my work so I can focus more on my real project.
Any lecture notes about 3D printing you could share (which are not available freely available on google search) ?
Many thanks in advance.
Cheers
Alev
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Dear Alev Sonmez, Use this textbook. I hope it helps you with your article.
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I'm searching for someone who has a RIP (Reactive Inkjet Printing) 3D printer. We developed two different inks for this type of printer. We would like to collaborate to create cellular scaffolds from our inks. If you are interested in or know who could be please send me an e-mail on michal.wrzecionek.dokt@pw.edu.pl
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What is reactive injet printing, I am not familiar with RIP, which reaction does the ink deliver? are there any applications or ideas yet?
regards Joachim Günther
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Do you think that the automatized 3D-printing technique will replace the traditional building method?
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I appreciate your contribution Dr. Guido Ehrmann . Thank you very much
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I want to know which is best SLA 3D printing photo polymer resin for preparing nano reinforced polymer composite and is it possible to prepare our own photo polymer resin or not. Please give your valuable suggestions. Thank you.
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Sorry for the typo, it's Irgacure 819.
I have just tried it with PEG 250, so don't know if it actually works with other polymers as well. As for the thermally stable UV resins, you might have a look at this paper
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Hello everyone,
I'm a new PhD student and I'd like to expand my 3D printing community. My research is around Multi-Material Multi-Material Additive Manufacturing for the creation of turbine blades.
Please comment or follow so I can follow you if your research is around anything 3D printing/additive manufacturing related; hybrid printing, multi-material printing for example. Research around materials science around plastics, ceramics and environmental materials, software and systems around 3D printers and turbine blades also.
I'd be grateful if you could comment or follow so I can follow you and your research.
Thank you very much :)
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Muhammad Harris Check Anisoprint, its a open system in continuous fiber printing, here you have control over polymers (any polymers) and slicing software. However, similar to Mark, carbon fiber are propriety material from Anisoprint...however, with bit of experience you can manage to print Mark fibers as well...
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I have references for SLA and material jetting processes but nothing for SLS or jet-fusion. Any assistance would be appreciated.
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Thank you Brandon for those references.
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Hello everyone
One of the most common defects in 3d printing, especially in the FDM process, is the lack of good bonding between printed layers. therefore, to achieve good bonding between layers, what is your suggestion to overcome this problem?
Best regard
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