BMC Derailleur Hanger #57

It's often recommended to have a spare derailleur hanger for your bike, because if it breaks it can take weeks for you to get one. So, before mine broke I measured mine and modeled it in FreeCAD so I can get it machined if need be. I printed a plastic specimen. In order to make it more rigid I deleted the large lightening cutout in the middle. The plastic hanger in PET-G is very flexy, but sorta works, the gears run up and down just fine.

After printing tap the small holes M3, and the big hole M10x1.