Redesigned extruder block with smaller drive gear hole (11.2 instead of 13 mm) -> longer filament support between the drive gear and hot end so flexible filament does not get stuck in between. As CTC that I own is an Makerbot replicator (dual) clone it should also work for Makerbot replicator and FlashForge printers, and as everyone is wellcome for testing it's still a WIP- some tweaking may apply Update 30 march : fixed the preview, added the explanation photo Update 1 april: Changed hole diameter to 11.8 so it does not need sanding, moved filament hole a bit, made a bigger diameter hole on the bottom so it does not touch the gear fastening screw