No magnets:
With magnets:
Print in place. No supports required. I recommend PLA and 0.2 layer height.
For the magnet version: Use 5x1mm with the thin cover, 6x3mm with the thick cover.
UPDATE: You can print the magnet version in two parts now. Just glue the two parts together. I wanted to put a design on the cover and I think this makes it a lot easier to print.