Here is the melted top of the head figure mentioned in the previous post:
same print slightly different light angle to bring out different details
In the meantime I got a somewhat better result (just printing top of head since the rest of the model prints fine and I don't want to waste time and plastic). Some settings:
Ultimaker Original
print in PLA
Layer height: 0.25mm (I'll do 0.1 or 0.15 for final version after fixing issues, but for sake of speed in testing, 0.25)
Wall thickness: 0.6mm (nozzle diameter)
Spiralize
Smooth Spiralized Contours
Speed 90mm/sec.
Temp: 214°C
Adaptive max. variation: 0.27mm
Adaptive step size: 0.03mm
Adaptive layer threshold: 200
It's almost usuable, at least there's no hole. I'm not sure what to tweak next to get rid of the peaks and valleys. Maybe reduce extruder temp at that z-height.
Below was the first attempt, for reference. Just spiralize, no adaptive layer height. I think the layer height was 0.15mm and the overall height 120mm, that hole about 30x38mm.
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gr5 2,295
Please show a photo of the "melted top". Otherwise, the advice you get here is often useless.
For parts with small top layers (like the top of the eiffel tower for example) we indeed get melting issues where the PLA never gets a chance to cool enough (not a problem for other materials as they are all higher temperature). The best solution is to print a tower next to your part that is taller. When the head moves over to the tower the part gets a few more seconds to cool. Alternatively I will print 2 or three of the same part.
Position the tower left or right of your part (assuming your fan(s) are on the side) such that the fan is hopefully blowing on the part while printing the tower.
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