I installed the Sanjiu feeder on my UM2 with other mods) The tinker firmware makes it easy. I had to invert the E axis, and change the E-steps (I think it ended up at 633, that post listed above shows you how to measure to calibrate)
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mastory 44
read this thread:
https://community.ultimaker.com/topic/21659-calibrate-extruder-with-cura-15/?tab=comments#comment-201643
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