The fischertechnik groove and peg connections are sometimes too loose, due to inaccuracies in 3D-printed parts or wear of the original parts. This washer will result in a tighter grip. It comes with 0.1 mm or 0.2 mm thickness.
Make sure to set "initial layer height" (in Cura) to 0.1 mm for the thinner version
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keywords: Fischertechnik washer