It s a card case with 2 magnets installed in each print parts, the size of the magnet is 10mm x 3mm x 2mm , here is an example of order https://www.supermagnete.nl/blokmagneten-neodymium/blokmagneet-10mm-3mm-2mm_Q-10-03-02-HN.
An M2 screw 10mm and nut it needs to complete.
It needs to install the magnets manually during the printing, after some tests i paused the printer at the height 2.40 installed and continue the print.
The author marked this model as their own original creation.