polypropylene (MJF)

Polypropylene printed by Multi Jet Fusion is a semi-crystalline thermoplastic processed as fine powder in a powder bed, where a jetted fusing agent and infrared energy melt each layer. Parts are dense but not fully isotropic, so strength and elongation differ between build directions, and the surface is matte and slightly grainy. No supports are needed because the powder bed holds the part, but depowdering is required, and large flat sections can warp on uneven cooling. Typical uses are functional prototypes and low-volume housings, ducts, clips and fluid-handling parts.