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(from a fellow user recognizing an old problem and cheking your model) There's are two corresponding steps in the top surface of your stl, and these take the levels either side just higher and just lower than half way up the layer height. They're only 0.00011027 mm (copied and pasted from Fusion :) ), so not surprising that was missed.
Neither of the upper surface heights in your screenshot are where you want the top surface. The middle section is half a layer too low, and the outer regions are half a layer too high. You can change layer heights strategically to make it top out at the height you want. Happy to talk through.
You might be thinking something like "but why doesn't the slicer stop at whatever height the model specifies." I'm not involved, so I don't have a definitive answer, but I imagine it has to do with the other millions of models the slicer has to cope with. You can choose settings to have it do what you need.
Description of the bug
slicing a model with flat top surface:
results in gcode file with extra layers on sides:
Project file & How to reproduce
extra the archive and start
./run
, to get the output model.extra_layer.zip
compare the top most layer in sliced output vs. the input STL
Checklist of files included above
Version of PrusaSlicer
PrusaSlicer-2.8.0+linux-x64-GTK3-202406270929
Operating system
Debian/12
Printer model
Voron 2.4 with stealthburner
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