I took the original model from Makers Manual which suits my printing setup and environment perfectly. But I have a bunch of 8mm x 3mm magnets in my drawer and adopted the model accordingly.
The Makers Manual version is a remix, too, but contains some improvements compared to the original.
The magnets have a very tight fit. Depending on your printers tolerances a small drop super glue might be needed (but shouldn't).
Printed in:
The author remixed this model.
I made only one change:
Remodelled the magnet holes, so that 8mm x 3mm magnets can be inserted.