Printing problem, my print started with no defect, but in the last steps of printing, I noticed some problems. First, an anomaly on the surface it was like a scar but with some tiny holes. It was like some extra filament was deposited between layers. I had to pause printing and manually sanded a little bit of the top layer. This solved the defects in the next layers. Then it started to collide with the supports, and broke them. It seemed that again there was the presence of some filament excess. This printing was a 35 hrs printing and the problems started to happen in last 7 hours of printing. The model was a Mandalorian helmet and it reached the maximum high of printing
My settings were
quality 0.2 mm, density 15%, wall loops 3, external wall speed 200, inner wall speed 300, support tree automatic, adaptative layer only in last layers of the helmet top surface
looks like too huch heat in too short a time / not enough fan cooling. Your upper layer issues are tied of course to dynamic layer heights. This is a very complex setting that has it’s ups and downs . Dropping to a slow speed and/or really small layers keeps the hot head near the plastic too much.
Don;t pause and sand, this moves the whole model and bed slightly. When printing the melted platic gets laid down, squished, then cooled by t he fan, it has a certain shrinkage too.
What filament are you using and what temp / speed are you printing.
This is a pretty complex model, does your printer work with these settings and filament print other simpler models?