Looking at the pics in the circled areas is a depression in the print. It is an exact reproduction of one edge of the hole in the middle of the print as indicated by the arrows. The bed is clean and has no outlines etc. I have printed this before and this did not happen. I print one or two at a time and each print has this. The only change is new extruders but I don’t see how that could influence this.
QIDI machine using S3D with PLA and standard settings.
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Is the print solid or are those top visible layers printing on an infill? It looks like there is a blower fan on the side of your extruder pointed right at the section you circled. Has the arrangement of your cooling fans changed with this new extruder? If the distance between the fan and extruder matches the distance between the depression and perimeter it mirrors then I think you have your answer.
-Jesse
Found out the problem. The right extruder nozzle was ever so slightly lower than the left (printing nozzle) so it was dragging but leaving no marks as a sign. Very sneaky!
So, the right nozzle was riding on the printed surface causing the whole extruder assembly to ride slightly high until it hit the opening then it would drop a tiny bit. A small shim under the right side of the extruder mount solved the problem.
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