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Inner vertical holes will indeed be about .5mm smaller. Also outer corners. This is because the hot PLA cools a bit in a fraction of a second and so shrinks slightly and as it is being placed acts like "snot" (stuff from your nose). Like a liquid rubber band. Because it is so stretchy it is pulling inward - but still in liquid phase - and so outer corners and inner holes are all too small. Especially on sharp curvatures like small holes or sharp corners (like those on the tip of a star).
However the sides of your rectangular object are not affected by this. I'm not sure why that would be smaller. .4mm versus 60mm is 0.6% which seems a bit high. Typically PLA shrinks more like .3% from the glass temp down to room temp. So I'm not certain what is causing that but I'm not particularly surprised.
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Inner vertical holes will indeed be about .5mm smaller. Also outer corners. This is because the hot PLA cools a bit in a fraction of a second and so shrinks slightly and as it is being placed acts like "snot" (stuff from your nose). Like a liquid rubber band. Because it is so stretchy it is pulling inward - but still in liquid phase - and so outer corners and inner holes are all too small. Especially on sharp curvatures like small holes or sharp corners (like those on the tip of a star).
However the sides of your rectangular object are not affected by this. I'm not sure why that would be smaller. .4mm versus 60mm is 0.6% which seems a bit high. Typically PLA shrinks more like .3% from the glass temp down to room temp. So I'm not certain what is causing that but I'm not particularly surprised.
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