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Pinion lock ring tool
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Model information
- Source
- Printables
- Category
- Tools
- License
- Creative Commons — Public Domain
I needed to replace the front sprocket on my stromer ST3, but I didn't realize I needed a special tool to do that. instead of spending 40 euros and waiting for shipping, I designed and printed this in under 40minutes, and it worked from the first time!
- I used 7 bottom, top and wall layers, plenty strong.
- You will need 8 M3x10mm bolts.
- I drilled out the holes with a 2.5mm drill bit
- Fits a 30mm socket
Too loosen the ring, you need to turn it in a clockwise motion. The sprocket wants to keep turning, so I put a hex key in one of the holes of the sprocket so it could resist the motion when applying force (see picture)