Can't seem to fix over extrusion I'm struggling to get my printer up and running for a few days now. The problem is as follows. I got a test model of a cube (40x40&nbsp;mm) and everytime I try to print it, the nozzle creates these 'lines' on the print which is caused by over extrusion I think? See image:



This goes on for every bottom layer and ultimately when it starts printing the infill the nozzle starts digging into the print and I'm forced to stop the printer, see image:



What I have tried so far:


Calibrating my extruder (by marking 100&nbsp;mm on filament and command extruding 100&nbsp;mm, check difference and adjust E step/mm accordingly)
Performed an auto bed leveling
I even halved my flow rate in the slicer (Ultimaker Cura), this gave signs of under extrusion of the first layer but the second layer looks over extruded again
Tried different temperatures in the range of 190-210&nbsp;&deg;C (I'm using PLA), made no significant difference


My settings and gear:


HE3D K280 Delta 3D printer
E3D V6 Volcano hot end (original, not chinese)
E3D Titan Extruder (original)
Marlin 1.1.8 using Ultimaker Cura as slicer
Nozzle 0.6&nbsp;mm, layer height 0.2&nbsp;mm, print speed 50&nbsp;mm/s
1.75&nbsp;mm PLA


If anyone could help me fixing this that would be great!
Your images look as if your initial nozzle to heat bed offset is too large. This causes the filament not to be squished. Try re-levelling and have a piece of plain printing paper have a little drag when pulled.