No-Slip Bowden Clamp

thingiverse

NOTE: PRINT TWICE AND MOUNT BOTTOM TO TOP. (Pictures are from previous sleek prototype) I was done with the bowden tube coming loose after some time when the tiny teeth inside the repurposed pneumatic fitting at the extruder outlet wore out from push/retract forces that they weren't built to handle. So I made this upgrade, which uses a M6 screw tube with 4mm inner diameter originally meant for a hotend, a washer, two M6 nuts, eight M3 screws + nuts to tighten everything up, and a piece of sandpaper that locks the PTFE bowden down. Use one layer of sandpaper only, and clamp it as pictured. It'll provide friction on one half of the bowden, and lock itself between the PLA blocks. After several hours of printing, the bowden has not pulled out at all, and I was able to dial down the retraction length as well. Currently working on an improved version that offers a twist-lock action between bowden clamp and extruder mount so I can prepare several heads/nozzles each with its own bowden.