First 3 mm layers

Could be a number of things but I'd look at the initial distance of the print head to the bed. Also reducing the flow on the initial layer could help.

If you focus on getting a good first layer, the next layers should be better too

Thanks Peter.

I'll redo the bed level calibration, this time experiment with the flow rate.

This might be helpful. I've added the z offset plugin to Cura, and increase the offset to 0.1mm. It seems to improve layers on the test cube, will test it with a larger print job.

Update: With large print it started to warp.