Bottom Bracket Seal for Shimano BB
thingiverse
A replacement seal for vintage (circa mid 80s to early 90s) Shimano Bottom Brackets. These seals were originally made out of rubber, though PLA also works well for their intended application which is to keep dust and moisture out. Fitting these seals into the BB cup is quite tight and requires squishing of the printed seal. PLA, if properly printed, should withstand this force. The cut-out in the rim on one side is designed to help with fitting. Once inserted they will stay in place and are the correct thickness to create a seal to the axle. These should be compatible for many of the Shimano BBs on the era - I hope they are useful for you.
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