I even got a BlTouch running. Anyway here is my first 20mil cube test. I think it is show over extrution. My settings are as follows:

PLA

Extruder 210c

Bed 70c

Extruder eStep 300

flow 105 %

Any opinions?

Thanks!

The bottom looks OK but the other layers are terrible.

The main problem is probably over extrusion, Try it with 100% and than change it with steps of 1% intill you get a decent cube. if it is not over extrusion, it might be a too high temperature and not enough cooling. 210°C should be fine for PLA but you can try a bit lower like 200°C - 205°C. 70°C is a bit hot, I would lower it to 60°C - 65°C.

Did you use a fan? this might help to get the lines and corners better, but shouldn’t be really needed for a cube. One last thing I could think of is printing too fast, the PLA doesn’t have enough time to cool down and you get results like this. Lower the printing speed to make sure this is not the cause.