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I would guess it is because of the heat? PLA print want to be cooled fast to below 50°C, otherwise they sag or deform. If you print 0.8mm wide and 0.4mm high sausages, that is a lot of heat. So I could imagine that they do not cool down and do not solidify quickly enough? So the walls stay somewhat soft, and are pulled inwards? Especially if the bed-temperature would also be quite warm. Molten plastic tends to be pulled into a thick blob. This is a guess, but it is the only thing I can immediately think of.
Thanks for the reply. Temperature would be my first guess as well, but since we have no problems at all with all other profiles I figured there would be something else going on.
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I would guess it is because of the heat? PLA print want to be cooled fast to below 50°C, otherwise they sag or deform. If you print 0.8mm wide and 0.4mm high sausages, that is a lot of heat. So I could imagine that they do not cool down and do not solidify quickly enough? So the walls stay somewhat soft, and are pulled inwards? Especially if the bed-temperature would also be quite warm. Molten plastic tends to be pulled into a thick blob. This is a guess, but it is the only thing I can immediately think of.
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