REMEMBER TO PAUSE THE PRINTER.
The design has embedded magnets. You need to pause the printer before the holes are covered.
The magnets I got them from hobby lobby
https://www.hobbylobby.com/crafts-hobbies/basic-crafts/magnets/rectangle-neodymium-magnets/p/80875260?queryId=4c1f3e564e866a24f7d2f62c12d28792
The author marked this model as their own original creation.