Climbing holds as fridge magnets
thingiverse
These are some refrigerator magnets made to look like rock climbing holds seen in climbing gyms. They utilize a 12mm x 2mm neodymium magnet available on Amazon or Ebay, super glued in. They are sized just large enough to be pinched with two or three fingers. Print settings will vary with each printer but I recommend 0.1 layer height to preserve the curves without post processing. I found around 5 top layers helped with pinholes appearing with the small layer heights at the very top of the model with 15% infill.
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