Thanks for the quick response! I know the model is flush at z=0.
Cura intersects planes with your model. if your layer height is .2 and the top most plane that intersects with your model is .1999 below the top it will skip the last layer so part of your error is probably this intersection issue. So height error can be almost as large as layer height.
This did give me an idea on what my possible issue could be. I do have the initial layer height set at 0.27 mm as per the defaults. Maybe this is causing my issue where at 0.2 mm layer height I'll end up with one layer left at 0.13 mm so Cura then ignores that layer? I'll try setting the initial layer height down to 0.2 mm and see how it affects the dimensions.
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gr5 2,224
Cura intersects planes with your model. if your layer height is .2 and the top most plane that intersects with your model is .1999 below the top it will skip the last layer so part of your error is probably this intersection issue. So height error can be almost as large as layer height.
Also click on the part in normal view and click the "move" icon on the edge and make sure Z=0.
Also it's good to level the nozzle a bit close to the glass to squish the first layer well but this can add about another .2mm of error (shorter). Add those 2 errors and you can easily get .3mm. I recommend you just make your model taller by .3mm but in theory you could twist the 3 leveling screws a bit to get .1 or .2mm of correction (but then your parts may come free from the glass during a print) and lower the layer height a bit (but then your print will take longer).
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