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Rock climbing hold fridge magnets. Just super glue a 12mm x 2mm neodymium magnet in the hole on the back and you're ready to send some fridge routes!

Using slightly finer layers such as .16mm makes the holds a bit smoother given the contour of the model.  

I recommend using the “fuzzy skin” setting for some extra friction on your tiny climbing holds. Make sure to only apply the fuzzy skin to the outside of the hold, not the magnet holds on the back.  I personally used “contour only”, 0.4mm point distance, and .2mm skin distance settings for my holds (Bambu Studio settings).

Optionally add some climbing chalk to really make those tough holds a bit easier to grip ;)