Prusa i3 x - Shifting Layers on thin/complex shapes

[Sandkuchen]

So recently I bought the Prusa i3 X DIY kit and assembled it succesfully.
Print after print Im improving the results but no Im stuck on a point where I dont know what to do.

As for now, the prints are quite precise when printing small, simple shapes (https://imgur.com/VCyOADl)
However, when I tried more complex structures I get the first few Layer shifting in Y-Axis/printed on brim when activated (the other Layers are fine, the brim is printed correctly!) and shifting Layers when the printer prints a lot of short lines
(I suppose, like the peak on the wheel in the last picture).
https://imgur.com/PehFlfi
https://imgur.com/emata04
https://imgur.com/RYoLcTR
https://imgur.com/KDCez5q
Somehow strange that the boxes came out well

I already checked the belt/tried different tension and also cut the Acceleration of the Y-Axis stepper motor by half in the firmware, because I suspected skipping steps due to too fast Acceleration.The Heatbed is moving freely when seperated from motor.

As mentioned the Printer is a Prusa i3 X, the Prints a running via Repetier Host (similar Results with Cura though).
Im running the Printer at 45mm/s with 0.2mm Layer heigth.

I hope theres someone who can help me with this strange Problem :)

[William]

1.I think you should check if the extruder is discharging normally


2.Increase the voltage of motor driver board A4988 up to 1.1V

3.You should ensure the extruder holder or Y axis platform is Tightly fixed

[Sandkuchen]

Ok so heres what I tried the last 2 days:

-Bed and extruder were and are fixed tightly, tested printing on table/floor, no vibrations
-Powered the motors from default somewehere around 830mV up to 1100mV and to 950mV, but it just got more messy and shifting
-I dont know what exactly is meant by "extruder discharging" but I think you refer to how consistent the molten Filament gets extruded? Theres always coming like 5cm out before the print starts (when heating up to 200°C) and the first skirt ring doesnt print till it gets a big blob extruded, but then very consistent printing.

What I noticed when printing my little round test subject: If the printing speed changes between Layers I sometimes get a shift, the first ones are printed slower, so when the printer gets faster, theres a little shift. More shifting with higher printing speed (tested with 20mm/s and 45mm/s

EDIT:

I changed the connection end Endstops from X and Y-Motor to see if the motors are not working properly - The print still got shifted in Y-direction