As the attached image shows, the outer skin of my prints is very blobby. It is caused by large amounts of PLA being extruded whenever a suck-then-prime step occurs, which is typically at the beginning of a perimeter.
I’m pretty sure the extruder is running correctly as the prints are not too thin or thick anywhere else. I’ve tried retraction settings from 1mm to 5mm and use 15mm/s retraction speed. The hot end is at 200 degrees, although I’ve tried it lower and higher without improvement.
It hasn’t always done this and I don’t think I’ve changed anything significant in the software configuration, which makes me think it is a hardware problem.
Yesterday I took the hot end apart to put in some tape to stop the PLA leaking problem, but the blob problem is just the same afterwards.
In case it’s relevant, I use Kisslicer and it is apparently sequencing the retractions properly, but the prime step always oozes too much plastic. I’ve asked it to start perimeters in random locations, otherwise the blobs build up on top of each other and cause other problems. I’m switching to inside-out perimeters, which should improve the aesthetics of the print, but it will still be a problem for thin / small areas.