Spare Parts for the Vintage Kasparov Chess computers, made in the 80s by SciSys or later SaiTek.
This was knocked up in TinkerCAD and stands 30mm high, made on request.
There is the "Castle / Rook" model, and a "magnet cap", which serves two purposes:
1) easier print with flat Castle / Rook base, as the magnet cap should protrude slightly.
2) flexibility on you choice of magnet with out manipulating the Castle/Rook model, I've chosen a black Ferrite Disk Magnet 10mm x 3mm disc
The author hasn't provided the model origin yet.