Yet another Z Shaft Coupler for Prusa Mendel

thingiverse

Initially, I purchased motors with short shafts featuring 90° flats, which caused difficulties when using standard couplers. To resolve this issue, I designed a custom solution that utilizes trapped nuts and grub screws. The nuts secure the motor shaft into the flats while three grub screws hold the z-axis screw in place. After printing and cleaning the parts, simply insert M3 nuts into the traps (using epoxy if necessary to prevent slack) and add M3 grub screws for a secure fit.