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1

Meshmixer (free, multi-platform) supports and imports .3MF file format. There's something amiss with the file named Macro Keyboard RC Ver2.1 Top MiniCutout. It appears that the object is created from two improperly overlapped objects that have been merged. The result is a hole that isn't quite a hole: The other files have holes that appear to be normal. ...


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As @Gunslinger suggested, I would also recommend Blender for these tasks. Blender comes with the Add-on "MeasureIt", which has to be activated manually in Edit ► Preferences ► Add-ons ► Official/Community ► search for MeasureIt, check the checkbox: Import your STL file via File ► Import ► STL ► ... Select your object and hit TAB to enter Edit Mode ...


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