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Your software could be crap.
I HIGHLY recommend to confirm you have extrusion problem using CURA 15.04.6 (not newer. Older is ok) because its simply and does not have many parameters that could screw up the process.
Looks like under extrusion to me.
Also possible causes is filament slip.
If you cant get 1st layer perfect, dont continue to the second.
1st layer must be printed perfectly. Filled without gaps and without signs of nozzle being too close to the bed.

It could be motor steps issue. I cant comment on that because i have too many modifications and dont know stock steps for any axis anymore.