Have you tried experimenting with pressure advance?

Assuming the nozzle is moving left to right at these seams, it looks like pressure could be a little too high as it decelerates into the end of the line, and too low as it speeds up out of the start of the line.

If the nozzle is moving from left to right in this photo (I don't know if it is or not) this looks like a classic example of where pressure advance may help. If you consider this part right circled in red, where a perimeter wall started in these two places, especially in the upper one you can see the line a little thicker coming into the seam and a little thinner coming out of it. I hope that You guys can give me some ideas where I should be looking for the solution. Unfortunately none of above attempts make any change in the surface quality.

Changing Z Axis Jerk (from low to high).

Changing Extruder Jerk (from low to high).

Different microstepping modes on Z axis motors.

Different microstepping modes on extruder.

Changing belt tension (from low to high).

Trying different flexible coupler mounting ways.

Loosing threaded rod backlash clearance screw.

Changing filament tension (from low to high).

Changing Z motors current (from low to high).

Changing Extruder current (from low to high).

Hotend temperature is stable, I'm using PT100 sensor which works great. Extruder: Titan Aero (chinese) with e3d pancake 0.9 deg. Everything is almost perfect! Except one problem which I think, may be a problem with Inconsistent Extrusion, but I'm really not sure at the moment. I have almost finished my printer based on Duet 3D Wifi.

Ansys apdl commands extrude