magnetic keychain customizable

Customize it to fit your magnet(s) and you key ring.
It has a cylindric hole in the middle.
Pause the print to insert your magnets.
For example:
I print the first layer at 0.3mm and all the others at 0.2mm.
I selected a base of 0.7mm so it's 3 layers.
I used 4 magnets, 1mm thick each (4/0.2=20). I paused the print at 4.7mm (at the 23rd layer), right before the first layer of solid infill and placed the magnets.
Resume as quickly as you can. If you delay the two layers won't stick together.