the top line is the start line and is intentionally over extruded.
the middle line looks like filament that hasn't been squished aginst the build plate, because the extruder is too high
and the bottom line looks like raw 1,75mm filament
try Jeff Jordan's 'Life adjust My way' assembly-and-first-prints-troubleshooti ... tml#p97199
there are V6.1 files at the bottom of the first page...
try that when adjusting Live Z...
if the filament is individual strands your extruder is too high, too small a negative number for live Z
If the filament has ripples or waves in the surface, then your extruder is too low, , your live Z value is too big and
If you have a lovely smooth layer with the edges of the filament merging with adjacent filaments, you are about right!