Bowden MK8 Pneumatic Fitting for 4mm PTFE Tube

thingiverse

I recently configured my printer to a bowden setup, but I quickly realized the significance of the missing Pneumatic Fitting on my MK8 Extruder. So I experimented with various solutions, some using hot glue (lasting for about 15 minutes before losing its grip), and also the Pneumatic from oguzhanuglu. However, the screw mount was only millimeters away from fitting, so I decided to create a remix to bypass the screw hole to the ML8. The solution turned out to be two different screws securing the PTFE tube (4mm outer diameter, 2mm internal) in place. The small metal screw used to secure the tube additionally is an M3 screw and provides extra strength to prevent the tube from moving. The hole is printed slightly smaller (2mm) to ensure a firm grip between the printed part and your screw. If it's too tight, you can heat the screw when installing it. I also hot-glued all the parts, just to be sure I never see a failed print again because of this setup. My frame that the extruder is hanging on is made of 6mm aluminum. After 11 days of printing, I can confirm that the PTFE tube will not move with this design.