Mount for LM8UU Bearings, designed to be compatible with the ones used with the RigidBot, but about 1.5mm shorter (they are not an identical replacement). Holes are designed for M3 screws, spaced 1.25 inches apart.

There are two parts, one where the screws thread into the plastic, another using M3 nuts. If using the part designed to work with hex nuts, pause the print at 5mm to insert the nut.

Update: added a new version (v2.1)