In this remix, I removed the divot for the magnet and added a 10x10x2mm slot in the middle for a magnet to be dropped in during printing. Please use the attached step file if you need to change the size of the slot for the magnet.
The attached gcode is a generic PLA profile with a pause added in to drop a magnet in. Prusa recommends adding a dab of super glue to the magnet so it doesn't potentially get stuck to the print head on the following layer.
The author remixed this model.