Improved version of my original magnets with 5 new cats, slightly thicker (5.5mm) and embedded magnets.

Choose the profile that match your printer and print the plate for the magnet size you want:

8x3, this plate uses 3 magnets per cat, 30 total.

10x3 or 12x3, both plates use 2 magnets per cat, 20 total.

I personnaly used 10mm magnet, holds pretty well for such big pieces:

They mesure between 75 and 90mm (width or height depending on the largest dimension).

You can customize magnet size and amount by editing the “magnet cutout” subobjects.

Pause at layer #17 (3.4mm) to place the magnets.

No ams is required, you can manually switch filament at layer #21 (4.2mm).

Be aware that if use a barely opaque white filament, the magnet may be visible through the top surface. So don't use really cheap filament.

Happy printing!