20 Tooth 2GT Timing Pulley for 9mm Belt

Install the timing pulley onto the NEMA17 shaft, oriented as shown

Align one of the M3 grub screws on the timing pulley so that it will tighten against the flat on the NEMA17 shaft

Position the timing pulley so the marked gap is 3mm

Slightly tighten one of the M3 grub screws to hold the timing pulley in position for now

The timing pulley will be aligned and fully secured in the next step

Position the NEMA17 motor up and into the motor cage from below, it will be secured in the next step