Note: these tests are not intended to calibrate your printer, but only to decide the XY scale factor on your slicer for specific prints that have very demanding precision requirement of length on one or two dimensions, but otherwise you don't mind having other measurements (such as inner diameters) potentially even more off! Read as: the values you obtain from this and other similar tests are not indended to produce final values for the XY compensation of your slicer, but only occasional!

A simple object and an excel file to calculate stl vs real dimensions, to eventually compensate x/y on your slicer. Note: you really shouldn't be doing this, as the printer should be calibrated on the basis of mechanical/hardware specifications of pulley, motors, etc. But it will help with material tolerances!

I liked the overall idea of the original thing, but decided to try a different approach (more applicable to my specific needs):
1) calculate dimensions for both X and Y;
2) reduce number of circles (anyway inner diameters can't be measured exactly with calipers);
3) use a max length of 145mm instead of 155mm, so it can be measured with any caliper;
4) calculate 3 dimensions for each axis: one short, one medium and one long (default 8, 35, 145)
5) have the dimensional information printed on the object itself
6) can be customized (see scad file)