The new MPCNC Primo stepper motors face with the bearing hole up. These covers will keep dust from getting in them. There's a slight gap around the inside edge that will let heat escape. If your stepper motors get too warm, you can print the one with the opening on it. This should help let heat escape out the top.
Category: DIYThe author marked this model as their own original creation. Imported from Thingiverse.