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Thank you Poly and MSU for the tips

Polygonhell wrote:Unless it's the first couple of layers, it's more likely to be too much plastic being extruded, you need to do an extruder calibration.

Would the 'flow tweak' have confirmed this? <0.80 it doesn't flow enough material to print without major holes

Using latest releases of Slic3r, Cura and KISSlicer I've observed the nozzle interfering / dragging on the previous layer, enough to deform the shape as it runs it's path. Using KISSlicer, I played with changing the nozzle width (trickery) and flow tweak from 0.50 - 1.2, didn't help only hindered. I ...