Printed at 0.2mm layer height, 4 walls.
I inserted a print pause at 4mm height for the magnet placement. The magnets I have are a tight fit and require an even press fit.
The version with ribs may be a very tight fit depending on your bit(s). This was intentional to avoid loose bits. If you find the fit too tight, use the version without ribs. If you get a bit stuck, pliers should be able to solve the problem!
The author remixed this model.
Changed the dimensions slightly to accomodate a 6x3mm magnet. Also added internal ribs to catch the retaining grooves that some bits have.