Palatis FricEx (belt driven friction extruder cold-end) (1.75mm filament)

thingiverse

An extruder code-end inspired by Gunstruder (https://www.thingiverse.com/thing:1247952). I basically designed this to avoid griding into the filament. Bill of Material: 1. 172mm (86t) closed-loop GT2 Timing Belt x 1 2. GT2 16T pulley (D13 * 14mm, 5mm bore) x 3 3. NEMA17 stepper motor (5mm shaft) x 1 4. D5 x 25mm shaft x 3 5. F685 (ZZ/2RS) bearing x 4 6. MF105 (ZZ/2RS) bearing x 2 7. M3 square nut x 4 8. sunken head M3 30mm x 3 9. sunken head M3 10mm x 1 10. sunken head M3 25mm x 2 11. M3 20mm x 2 (for pulley tension adjustment, any M3 longer than 20mm will work) 12. 4mm PTFE pipe fitting (M6 threads) x 1 or 2 For mounting the cold-end to 2020 aluminum extrusion, you will need: 1. sunken head M3 30mm x 2 2. M3 T-nut x 2 or duct tape / superglue... Assembly: 1. insert the 2 MF105 into the filament idler pulley 2. insert the 4 F685 into the top / bottom casing 3. Insert the square nuts into the square holes 4. Install the 16t belt pulley on the motor 5. install the 2 16t idler pulley on and the belt, arrange them in a triangular shape 6. screw everything together 7. adjust the tension of filement idler pulley Extruder steps/mm example: ``` stepper steps per revolution * microstepping / (stepper pulley teeth * belt pitch) = 200 (1.8deg) * 16 (microstepping) / (16 (teeth) * 2 (gt2 2mm)) = 100 steps / mm ``` however, always calibrate E-steps/mm for your printer.