Gear and Mount for Slip Ring

A gear designed to work with this slip ring, along with a mount and gear to use with a 28BYJ-48 Stepper Motor such as this one

The slipring gear is a 1mm pitch, 54-tooth gear. The grommets and washers allow for use of M3 screws without nuts. The gear for the stepper motor is a 1mm pitch, 15-tooth gear. Depending on print accuracy, you may require a M3 screw to keep it in place. Mine fit snugly over the stepper motor's output shaft with a small amount of force. The bracket also takes two M3 screws to mount to the stepper motor.

The holes for the slip ring don't line up perfectly, but you can convince the grommets to go through with only a little effort.

I didn't think about the difficulty of holding the grommets still while inserting the screw, so they'll have to be gripped with a pair of pliers or something similar until I update them.