Polypropylene (PP) filament is a new semi crystalline thermoplastic used in Fused Filament Fabrication (FFF). PP filament is a homopolymer and has wonderful properties that make it a useful plastic. Polypropylene has a high level of flexibility yet has great toughness meaning it is elastic without being too soft. Polypropylene is resistant to many chemicals and has a high resistance to electricity making it useful in electronic components. Naturally, polypropylene filament will stick well to a surface made out of polypropylene.