Provided with brand new EAGLE 12 speed system, this tool allows you to set the correct distance between the pulley and the cassette.
You are absolutely free !
I printed it in PLA, no need to set the infill as it's really thin, it will affect only 1 layer if you print it in 0.2mm (like in the Gcode for MK3S printer provided)
The author hasn't provided the model origin yet.