OrangePi Zero 2 magnetic mount for Prusa CORE One

This is a magnetic bracket compatible with the case from Orange Pi zero 2 case for I3MK3S by @johnytriplex, intended for mounting it to the side panels of the Prusa CORE One.

There are two variants provided:

• Magnetic - 6mm × 2mm to 6mm × 3mm:
  Designed for 16 cylindrical magnets of size 6mm × 2mm, but also works for slightly thicker ones (e.g. 6mm × 3mm). The magnets are press-fit and there is a smaller hole on the reverse side to allow removal of the magnets if needed.
  
  Note that the size of the magnets isn't ideal. Larger magnets would increase holding strength and probably end up cheaper, since you'd need fewer of them. I went with this size only because those were the magnets I had on hand. 
   
• Blank:
  Intended for users to add custom holes using negative volumes in their slicer. Remember to add clearance around the magnet: I used 0.045mm on all sides for the press-fit for the 6mm × 2mm model. I also chamfered the edges of the holes to help insertion. An easy way to achieve a similar effect is to add a large elephant's foot compensation in your slicer (perhaps 0.5mm).
  
  (Also consider adding pockets for rubber feet that would sit flush with the surface of your magnets. See the Future improvements section below.)

If you have requests for other sizes and want me to add them to this model, please don't hesitate to send me a message!

Printing instructions:

The brackets were designed to be printed with the large flat side facing the print bed. This is the default orientation of the provided 3MF and STEP files.

I printed mine in PETG with a layer height of 0.2mm and 0.4mm nozzle. Thicker layer heights might cause the magnet holes to be squished inwards, making them too tight. I encourage you to print out a sample with just a single hole in it if you want to experiment with your settings.

The press-fit magnet holes have a smaller hole on the reverse side, for poking the magnets out if you ever want to remove them. These holes are separated with a thin 0.2mm sacrificial layer for printability reasons, which can easily be poked through when you remove the magnets.

Future improvements:

The perpendicular holding strength is more than sufficient, but when mounting the case on a vertical surface, friction becomes more important. The case might slide downward over time, especially when exposed to the vibrating printer. 

To fix this, the friction can be increased either by using stronger magnets or by adding anti-slip silicone or rubber pads, or magnets coated in rubber. The pads can't sit too proud of the magnets, so ideally there should be shallow pockets for the pads to make them flush. Accommodating every possible size and thickness of such pads does not sound feasible, so any future solution would need to be easily adjustable.

For now, you can reuse a couple of the magnet pockets and pad them up with hot glue if the rubber pads sit too deep.

Changelog:

2025-05-11: Tested the 6mm × 2mm with thicker 6mm × 3mm magnets and updated the text to reflect that.

2025-05-11: Added comments about friction and how to improve it with rubber pads, added section about future improvements.

New bracket with holes for magnets, intended for mounting it to the metal frame of the Prusa CORE One.