Hi
Can’t figure out what the problem is in these pics - PLA printing neatly but with a pattern of holes in.
Any guidance for a solution appreciated.
Looks like it is under-extruding what with it being so equal.
Thanks for the reply. Yes I think it is - have upped the extrusion stepper rate. Still extruding more in pulses than a smooth flow, but maybe that’s normal.
Hello @BZbz …! 
Welcome to the Creality Forum…! 
Have you tried other filament rolls with same results..?
What kind of PLA is that..
Temps…?
Any Mods..?
Hi
Having tried new filament by a different manufacturer, upping the e steps on the extruder, changing the nozzle and checking it was clear, it now seems the drive belt needed re-tensioning.
So, the problem has been solved by both upping the extrusion rate (e steps) combined with re-tensioning the main belt 
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