Quick release for direct drive wheel simulators. It is based in an original design by Racing Mat from xsimulator.net forum. It is improved so can be used as a quick release using a 34.9 bike seat clamp or just attach it to the shaft with one M6 bolt.
Used in my OSW (open sim wheel) system.
More info in http://simuhack.com
Designed to print without support
0.4 nozzle, 0.2 mm layer, 4 perimeters and 4 top-bottom layers.
Using XT-CF20 to increase strength requires low speed (~40mm/sec)