Parts made from these PAEK filaments, a family of materials that includes PEEK and PEKK, remain strong in high temperatures and hold up to wear from repeated use. They don’t degrade when exposed to most chemicals, so they’re often used to print parts for demanding chemical processing applications. Print these filaments on a fused filament fabrication (FFF) 3D printer. Because of their high melting point, you'll need an all-metal extruder and heated printer bed to reach their minimum printing temperature. Without the heated printer bed, parts will cool too quickly and warp.

Maximum exposure temperature is the point at which a printed part will begin to deform. Above this temperature, your printed parts will start to lose structural integrity.

Annealing is the process of heating prints to a specific annealing temperature and then slowly allowing them to cool. This makes the finished print harder, stronger, and better at resisting heat. Maximum temperature after annealing replaces the maximum exposure temperature once this process has been completed.