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Hi, thank you for telling me that! It worked fine with the printed rails I had, but they may not be at the right dimensions themselves.
If I were to add 1.5mm to this sight I would print it 105-108% of its original size, the rest depends on your printer and its tolerances. You do not want too much clearance between the rail and the sight as it may leave it unstable on the rail. In my case i always prefer to use a little sandpaper if I need to.