Print Quality (stripe looking surfaces/missing ABS)

hi all,

Im having some issues with my print quality,

As you can see (hopefully) from the images there are som surface defects looking like stripes that are made from lack of extrusion at those particular lines. Most of the times this doesnt effect the infill and is only a perimiter issue, however there are times when entire layers become weeker.

suramu

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I thought what I'd do was

What type of rods are you using for your Z? What layer height are you printing at?

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this is a flow issue with extruder. your feed stock is not flowing evenly as filiment.

what is your perimeter speed? also is it 1.75mm or 3mm feedstock. settings should differ for retraction on 3mm, vs 1.75mm.