Investigation of Sparse-Build Rapid Tooling by Fused Deposition Modeling

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Iyibilgin, O.
Leu, M.C.
Taylor, G.
Li, H.
Chandrashekhara, K.

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University of Texas at Austin


This paper describes the investigation of sparse-build tooling by Fused Deposition Modeling (FDM®) aimed at rapid tooling with reduction in the amount of material. Sparse-build test coupons having ULTEM as the material and varying air gap (sparse spacing), wall thickness, and cap thickness were fabricated using the sparse and sparse-double dense build styles of the Stratasys Fortus machine. The strengths and moduli of these coupons were measured in compression and flexure tests. The strength/mass ratio and modulus/mass ratio were compared among the various coupons, as well as with solid coupons, to investigate the effects of the two build styles and the three sparse-build parameters. In addition, the effects of build direction and raster orientation were also studied.


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