utkudemi

There is this knocking noise from extruder stepper. Please help me to figure out the problem.SKR 1.4 Turbo + TMC2209 ( vref=0,8V ) + Marlin 2.0.9.3 Here is the list of what I did to solve this,I removed filament so it is not about the hotendI changed TMC driverI changed connection port on mainboard ( used E1 port instead of E0 port )I unplugged steppers cable and plugged to x / y and z steppers , this time sound transferred to that stepper.As I understooed, extruder stepper is making tiny and sudden retractions during the xy direction changes of nozzle while printing. That knocking sound comes from that little retraction moments. It is not effecting print quality but very disturbing and loud. I have made 2 videos. In the first video retraction moments can clearly be seen.

Hello, How can I linearly reduce print speed ? I have a tree like model which tapers at the top, and I want to print slower as layer number increases, since this will reduce the shaking effect at top layers. ( I have ender 3 pro, table not static )