No-Slip Bowden Clamp

cults3d

PRINT TWICE AND MOUNT BOTTOM TO BOTTOM. (Pictures are from previous blocky prototype) I got tired of the bowden tube coming loose after some time when the tiny teeth inside the repurposed pneumatic fitting at the extruder outlet wore down from push/retract forces they weren't designed to handle. So I made a replacement, which uses an 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 some hours of printing, the bowden has not pulled out at all, and I was able to dial down the retraction length too. 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.