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Hello sashalex007! I installed your mod yesterday I've been experiencing severe underextrusion. I calibrated my extruder and did a PID calibration, so I eliminated these things as suspects. I suspect it might be because of an incorrectly sized bowden tube. Can you give me an exact measurement of your own so I can cut it to size? I can't think of a way to accurately measure the distance from the extruder to inside the nozzle, where the bowden is supposed to touch the nozzle.
Edit: I also upped the VREF a bit for all the stepper drivers, so that can be excluded from the underextrusion equation.
Edit 2: I ended up disassembling and reassembling the whole hot end and eyeballed the bowden tube. So far so good! Really enjoying this desing now that it's free from underextrusions! Best DD mod EVAH! Kudos!