Today I designed and printed a lid for the washing pole hole, the old one had pretty much turned to dust.
I measured the old one using calipers and modeled it according to those dimensions. In fusion 360 everything looked fine, and the dimensions were the same in cura (I checked). When the print was done, I noticed it didn't fit as snugly as the old one. When I measured them next to eachother, I noticed the one I printed was about 1mm smaller (the diameter of the bottom part).
I had printed parts before to a specific size, e.g. stuff to fit bearings in, and that always turned out fine. So I made a calibration object to check if the steps/mm were set correctly. I measured a bunch of distances in both the x, y and z directions, but I'm not quite sure how to interpret them. For example:
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axis modeled (mm) measured (mm) X 100.0 99.75 20.0 19.80 Y 100.0 99.80 20.0 19.70
On the Z-axis the print was consistently ~0.1mm too tall, which I don't think is much of an issue.
So although the size is not exactly right, the error is not very big (at least I think, do you guys get similar results?) This does not explain why my print turned out too small. Both prints were made with the same filament (MakerPoint Ultramarine PLA), printed at the same temperature, and approximately the same print settings.
Any ideas on what I could've done wrong, and how I can improve my prints?