These are face-plates to use standard NEMA 8 stepper motors with LEGO® Technic.
These are face-plates to use standard NEMA 8 stepper motors with LEG...O® Technic.
Note, there are 2 types of NEMA 8 motors, one with 16mm mounting bolt spacing, and one with 15.4mm. Please measure yours, or print both plates...