These 3D Printed Magnetic Panel Clips on any 2020 Extrusion based enclosed printer. I'm using these on a Voron 2.4, but anything other 3d printer should work fine.
https://www.printables.com/model/8473...
Depending on the size of the 6x3 magnets (if they actually are 6mm wide), you may need this remix:
https://www.printables.com/model/3828...
Filament used can be purchased at Amazon where I earn a commission that is directly applied to content creation on this channel: https://amzn.to/3L8UTKk