Bike speedo holder for keychain

thingiverse

This holder stores your Sigma bike speedometer when not in use - simply remove the unit after a ride, then snap it onto your keychain for safekeeping. It uses a simple ejector mechanism inspired by a bayonet system. The result is some overhang, but you'll have no problem as the only additional action needed is to detach (cut or break away) the internal ring after printing is complete. Print Settings: Rafts: No Supports: No Resolution: 0.15mm Notes: Remove the holder from your printer without a support - everything necessary for attachment has already been incorporated and can be easily severed with a knife.