Hi Bob Hepple
A sheet of paper is easily penetrated by heat, that does not help enough. Basically keep overhangs from the heated surface away, or use adjacent support material (...angled deflection (thin) walls with thick & directly between lying bottom) that grows along without direct contact. Better is a repositioning of the object, so that overhangs arise far above the platform. Create support materials as possible in the interior of the object, so a later possible visible outer shell remains clean.
What material are you using for this item?
Anyway, 180 degrees is probably too cold, PLA is incredibly tough at this temperature for example, almost like chewing gum! The material flow could be very uneven. Amazing that you can print with this low temperature at all, or is it perhaps BioFila from TwoBears? Try 205 <<< 210 <<< 215 degree nozzle / 45 <<< 60 degree bed, Layer 0.1 >>> 0.15mm, speed 35 >>> 42.5 >>> 50mm/s.
Use "only" for the first layer 220/77 degrees / 20 <<< 25mm/s., For these advanced settings use the "Tweak At Z" plug-in. Made so get your object better adhesion for direct printing on glass.
Markus
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3dmaker4u 0
That's an issue caused by overhanging.
The point is that, if on a particular layer, the perimeter starts to curl in a region, it will evolve vertically, and perhaps extend horizontally as the layers build up. There is definitely more heat in the affected area. Could be that retraction takes place nearby, before jumping to the next layer.
As with any overhang, the factors affecting the result are temperatures, cooling, speed and layer height. You already have good values for the parameters, but seems that they did not suffice for the filament you are using and/or the part you are printing.
Also note that "screening" the bed may also have side effects. Since the heat has to escape somehow, it will find the "least resistance" path. This could be along the edge of the "screen" that is on the printed part side. Which is something you don't want.
I would try a slight increase in layer height (1.2-1.5 mm).
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