This purchase includes a sub license RTS20
RTS20 = Right to Sell 20
With this purchase, in addition to the set license, you have the right to sell 20.

The included 3mf file has a pause set for placing the magnets.
If you want to create your own slicer file here are some suggestions
Print at 0.2 layer height.
Put a pause at 4.4 to allow for placing Magnets in the print.
Slow the print down on the layers near the magnet placement point.
Do not use the Input Shaper (it does not leave a clean outer layer near rounded areas)
Using these magnets
https://www.amazon.com/gp/product/B01MSTKTSF/?&_encoding=UTF8&tag=10x1309-20&linkCode=ur2&linkId=6e4f1423e7e4a20a78824f5e1053be17&camp=1789&creative=9325
The author marked this model as their own original creation.