This part is a remix of: https://www.thingiverse.com/thing:8959

• Mounting holes were moved to 29mm spacing to fit a commonly available 2WD robot chassis.
• Mounting holes were enlarged from 3mm to 3.1mm to better accommodate M3 hardware.
• Undercut area between ball and plate filled in to allow for printing without supports.

A 5/8" ball bearing works perfectly with this caster housing.