About this 3D model
This model is designed for magnets to be inserted during printing, to be sealed inside. I used 6 mm x 2 mm neodymium magnets from Amazon. With 2mm thick magnets, they can be inserted at any point after the halfway point, when the case changes color. Hit pause in the print, insert a single magnet into each slot and make sure it is fully below the current printed level. Then hit resume and let the print complete!