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

Meeting Name

25th Annual International Solid FreeForm Fabrication Symposium (2014: Aug. 4-6, Austin, TX)


Mechanical and Aerospace Engineering


The authors gratefully acknowledge the financial support from America Makes – National Additive Manufacturing Innovation Institute.

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type




Publication Date

06 Aug 2014

Included in

Manufacturing Commons