The author remixed this model.
I added modifier STLs for this great design, which allow embedding two 4.8mm x 4.8mm magnet cubes per side.
How to use the added STLs:
This way, you will make room for the magnets and add a cover to embed them.
You then need to ensure that you add a toolchange or color change in the last layer before the cover is printed. That way, the print pauses, and you can add your magnets.
See my uploaded .3mf file as an example.
Thanks, Jeroen3, for your great work; you saved me quite some effort :)!