CR10 Extruder Arm, Double Shear

thingiverse

I frequently print Nylon on the CR10, requiring a substantial amount of compression force on the extruder gear to ensure the nylon filament grips and flows smoothly through the Bowden tube. However, the stock extruder arm is designed for single shear, and increasing the spring force or using a fastener to push the arm causes the moment produced to crack the arm, resulting in the bearing sitting at an angle and preventing the extruder gear from gripping the filament effectively. To resolve this issue, I plan to add a small tab and utilize a longer M4 screw to hold the bearing in double shear. This modification should eliminate the problem and provide a more stable printing experience. Within the next few days, I will test this design and update this post with my findings. Parameters: I print using a raft, 100% infill, with support, 0.2mm layer height, PLA.