Golf magnetic allignment tool
thingiverse
Didn't want to spend 30$ on one of these on amazon so I just tossed together this simple design myself. I personally printed at 50% infill to give it some heft, and the slot is for a 20mm x 3mm neodymium round magnet. I found it to have the perfect leeway for my printers settings, you may find it too tight or too loose on your printer depending on the accuracy so I would suggest using superglue to keep the magnet in place or a knife (be careful!) to open up the hole slightly.
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