M3 Bolts/Nuts Tolerance Multipurpose Tester

N.B: this is WIP / need comments.

I had this need because i was hired for a design job and another company was doing the prints.It was a pain to get a sense of their printer's printing offsets/bias regarding screw holes (bolts / nuts)
=> For the future each time i start a project i want to first send this element to print before i design anything.

NOW THE DETAILS :
On the left, next to M3 and in the middle we have:
a regular 3mm hole (H) with 3.55 nut. (N)
under it, on the edge a half-hole with same H&N and 3mm deep (D)
on top a threaded hole going trough the whole tool and with a 3mm thread (T)

Then after the little gap we can find the following settings (from left to right, in mm)
2nd vertical line of holes : H: 3.1 / N: 3.56 / D: 3.1 / T: scale factor 1.1
3rd vertical line of holes : H: 3.2 / N: 3.57 / D: 3.2 / T: scale factor 1.2
4th vertical line of holes : H: 3.3 / N: 3.58 / D: 3.3 / T: scale factor 1.3
5th vertical line of holes : H: 3.4 / N: 3.59 / D: 3.4 / T: scale factor 1.4
6th vertical line of holes : H: 3.5 / N: 3.60 / D: 3.5 / T: scale factor 1.5

If like me you need to really see how your prints will result on a certain printer this
could be a good tool.
Once you make your real M3 screws fit in you can report the little bias/offset on your whole design. you'll be sure that the print on the side of the print provider will look like you want, holding the M3 screws nicely.

I have in plans to make versions for other sizes : M2.5 / M4 .. tell me in comments if it's a good idea !

inspired by
https://www.thingiverse.com/thing:2347149
and https://www.thingiverse.com/thing:3418808