Bike Friction Shifter v2

thingiverse

Working bike friction shifter! I've been testing this on my main bike for about 2 months now - and it seems to function just fine. Additional parts required: 1x M6 25mm Socket Head Screw 1x M6 Washer 4x M4 25mm Socket Head Screws Print with 4 or more shells for good strength. I've had the best luck with standard PLA for the base. If you have issues with the print delaminating when threading the screws - try printing hotter / reducing the cooling fan. (I did not have good luck printing in 20% Carbon Fiber PLA - tended to delaminate). The lever can be printed with a harder flexible filament (Shore 95a or harder). This makes for a nice feel. If going this route - I recommend printing as close to solid as possible (ie - 10x shells / 75+% infill). For the lever in this print I used "Overture TPU" filament. I am using it with a Shimano XT-R 10-speed setup. There is plenty of additional cable pull capacity. I suspect it will work with any derailleur setup currently on the market. The clamp fits snuggly on a standard 22.2mm handlebar diameter. Does not seem to require any tape / etc. for a secure mount. Tighten screws evenly - but only tight enough to make the shifter reasonably snug. All holes are self-tapping. I have not had problems with the screws backing out. Slicers / printers etc. may effect holes sizes. If things don't cooperate - tweak the OpenSCAD files as needed. If you encounter issues with threading - you could always thread the holes manually with a tap. I specifically designed this shifter to be installable without re-running the derailleur cable - or having to take off grips / etc. This makes it easy to iterate / try new print settings if you encounter issues. (This project is a much-improved version of my original 2013 design: https://www.thingiverse.com/thing:112602 )