Print size not match stl file size

I am using an Original Prusa mk2 which is about 14 months old with firmware 3.1.0 and Slic3r 1.39.1

when i generate g code for a test square and print the square the measurements are correct.

when I generate g code for a complex object with internal circles etc., the external measurements are correct but the internal circles etc. are small by about 0.20mm.

I noticed this when printing the "x-carriage-back.stl" for my MK2 to MK2.5 upgrade.

Is this a firmware error or a Slic3r error or something I am doing?

usually I do not notice such small errors, especially with internal sizes but in this case I am afraid the parts might not fit when I try to assemble the hot end and bolts.

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