PEKK (FDM)

PEKK printed by fused deposition modeling is a polyetherketoneketone, a high-performance semicrystalline polymer, extruded as filament and deposited layer by layer, usually in a heated chamber. Parts are anisotropic, with lower strength across layer interfaces than along the rasters, and small voids remain between beads. Crystallinity and warpage depend on chamber temperature and cooling rate, overhangs need supports, and annealing is sometimes used to raise crystallinity and relieve residual stress. Printed PEKK suits lightweight, heat- and chemical-resistant parts such as aerospace brackets and ducts, tooling and fixtures.