With the new recreus hotend you can print Filaflex and any material ABS,PLA HIPS etc, without problems, we have tested during months in extreme conditions, 46 hours continuous printing with any problem. 1.The improvement is the ptfe tube inside the stainless steel M6 barrel makes that high friction and extremely soft materials like filaflex slide smoothly throughout the tube to heat-fuser and nozzle. 2.High quality stainless steel with a low thermal transfer coefficient combine with high quality aluminiun heat sink with high thermal transfer coefficient creates a very cool HOTEND, we insert directly (always with a fan) in direct drive abs part. FILAMENT COMPATIBILITY