Print these polypropylene filaments into filters, gaskets, and other lightweight, foam-like parts that let air and gas pass through but repel water. They contain a filler that dissolves in water, forming hollow spaces that make up 45% of the part. Polypropylene is known for being rigid yet flexible, so it absorbs impacts and bounces back to shape after bending, making these filaments good for compressible seals and living hinges. It also resists hydrocholoric and phosphoric acids, as well as other nonoxidizing acids and bases.

These filaments work with fused filament fabrication (FFF) 3D printers. If using a glass print surface, apply an adhesive to prevent the filament from detaching. The recommended print speed is 25 mm/s. While polypropylene is likely to shrink, the filler in these filaments supports your design, preventing it from losing shape as it prints. Submerge your part in hot water for about 24 hours after printing to dissolve the filler and expose the pores.

For extra support when printing complex designs, use structural support 3D printer filaments. They dissolve in water at the same time as this filament’s filler.