Pillow block for 608 bearings. The internal diameter is 22mm, it has two 4mm mounting holes at 40mm spacing. Overall width is 50mm, height is 28mm and depth is 9mm. It has an internal lip to retain the bearing, which is 2mm thick and has 18mm internal diameter. The rotation axis is 14mm above the mounting base.
It requires one 608 bearing, with 22mm external diameter and 7mm thickness.
Printed this in PLA and the bearing was a good tight interference fit (make sure the bearing is lined up straight with the hole, use a coaster or a bit of wood to protect the bearing, then just tappy tap tap it in...)
0.2mm layer height, 0.8mm shell thickness