Hate hate hate the stock arm cuffs on the Minelab Explorer Series. I recently got back into the game with a used Explorer II off ebay that didn't come with a strap. So, I opened up OpenSCAD and made a customizable arm cuff.
The code probably needs some work and I'll clean it up and upload a new version soon.
I printed mine in PETG so it could take the sun and not melt like with PLA. ABS would be lighter, I just don't like printing ABS that much.
Doesn't need supports. Since it's tall I printed with a brim just to make sure it didn't get knocked over during printing.