Customizable Miniature Base

I was in need for some miniature bases with magnets, so it's the moment to learn that Customizer thing.

The example stls are in 20, 25 and 30 mm diameter (with place for a 3x2 mm magnet), 40 and 50 mm (5x2 mm magnet) and a 75 mm (10x2 mm magnet)

I Print them Bottom up so I avoid support

In the Future I want to add Oval and Square Bases.