Ultegra 6800

[Zaphod]

Thanks for your fast feedback, I think the derailleur is Ok, very light using the normal shifter. The required pull length is 25mm, the servo does about 170deg so I’ll try a smaller diameter. The servo must draw high current as its getting quite hot. Batteries are LiFe type, almost no voltage drop even on high current and the servo is 6.6V LiFe type. 
Attached the STL file from the 32mm diameter.

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can’t attach stl, screenshot instead