For a small table with 38mm balls, this design has tight clearances. When racked, there is a total clearance of 2mm (1mm per edge). Fileted (contact) edges to reduce chances of damaging the felt. 2.5mm thick walls. Fits the MK3s bed.

Designed with Fusion 360 with simple parameters to change ball size, thickness, rack lip size, height and clearances. Can remix for different size balls. Just use the CHANGE PARAMETERS function to modify to simplify your life.