Burning 3D Prints: Which Filaments Catch Fire and Why

A Maker’s Muse fire-test examines how different 3D printing filaments burn: PLA ignites readily and burns with a dirty flame, HTPLA resists ignition, PETG is hard to ignite, ABS/ASA burn with a sooty yellow flame, and TPU is the least flammable (though foam TPU can burn more aggressively). The results suggest choosing PETG and TPU to minimize fire hazards, with burn behavior largely influenced by filament additives and formulation.