A minimalist egg piercer. The magnets can be press fit into the big holes. Put the needle with the point inwards in the small hole at the end. Cut the needle about 1 mm from the PLA piece, then take it out again, fill the hole with superglue, turn the needle around 180 degrees and stick it in there. When the glue has set, you have a tiny egg piercer that can be stuck on your fridge.