![]() You will notice that when printing square holes the corners also are moved inward. So it's like stretching a rubber band around the inside of a circle and it is pulling more inward than you want it to go. AS it's printing the inner vertical holes it is pulled inward because it is also cooling quite a bit in the first millisecond and is already shrinking. ![]() The basic problem is that PLA sticks to itself even when liquid - like a liquid rubber band - like snot. ![]() If you change filament, change nozzle temperature, change room temperature, all these tolerances will change slightly. So Sander's profile will help a lot but at some point you have to adjust the dimensions in CAD if you want accuracy to 0.1mm or better.
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