Shimano Bike Shifter Cap
thingiverse
Replacement bottom cap for a Shimano bike shifter lever. Fits the left side, so just mirror the part if you need the right side. Unfortunately I don't know the model number for this shifter but if you recognize it, this part fits pretty well. You may want to add support material around the little peg on the inside (mine broke during printing, but the cap still stays in place without it).
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