Lulzbot SemiFlex TPE 3D Printer Filament, 0.75 kg Reel, 3 mm, Snow Hot-end print temperature 230C Adheres well to bare glass and PET or painter's tape covered print beds. No bed heating required. We do not recommend printing SemiFlex directly on PEI print beds LulzBot TAZ owners should use a LulzBot FlexyStruder or FlexyDually tool head for optimal results when printing SemiFlex Durometer: 98A