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The size of part that can be produced in a single build on any of the commercially available Rapid Prototyping systems is limited by the size of the particular machine's build envelope. Parts which exceed the dimensions of the build envelope are split into sections that fit the machine's envelope and these sections are fabricated separately. Assembly of the sections into an accurate three dimensional object often requires the creation of a fixture. This fixture ensures correct positional and angular orientation of the sections during assembly. This paper discusses the fabrication of such fixtures using Shapemaker II, a Solid Freeform Fabrication process developed at the University of Utah. Using Shapemaker II, large fixtures (4 ft. by 8 ft. or even larger) can be created in just a few hours. While the fixture is reusable, given the low cost of the fixture, it can be considered a throwaway item.