I own a Wyrmwood Modular game table and always found the bit holder accessories they make a little too shallow. I designed one the same width of the small cup holder with aa dish 120mm x 71mm x 36mm deep. I also designed the magnet holes to take the same size magnets they use at wyrmwood for the accessories. In the pictures i used the size screw they use in the dice vaults. The bit holders hold just fine. They'll break before the table but are sturdy enough when printed flat.

If you print them on the front end you get a more accurate height, but you have to use tree supports touching build plate and you get a rough side on the inside of the bowl.