Hey all,

Printed a spiral vase and when it was printing, looked great and was really happy. When I took it off the heated bed, I noticed at the back of vase was a build up where the layer started and stopped. I thought at first it was a cooling issue but maybe its actually a retraction issue? I didn't see any stringing when it was printing but not sure what it can be? Looks like extra build up - some I can cut off but also looks like it hasn't set well. Just at the back down the seam. Everywhere else on the vase looks perfect! Here is a pic:

PXL_20210630_164402961.jpg

This is printed with an Ender 3 v2, treated glass bed, PETG, 240'c nozzle, 80'c bed, 0.4mm thickness, 2 layer wall thickness, 0 cooling initial layer and up to 50% cooling by layer 6.

Any ideas on what this could be? Any settings I can try to remove this? I thought maybe trying the randomised starting layer position (is that a thing?).

Many thanks in advance!

Ben