3-axis printer dimension calibration and supporting documentation

This is an accurate solution for calibrating your printer's steps/mm for X, Y, and Z (but not E).

Everything isn't actually bigger in Texas, all measuring devices are incorrectly calibrated in Texas. And if you think that's funny, then this is the right post for you, fellow standards enthusiast!

Most printer dimension calibrations are taken from a single measurement. If you only take one measurement for each axis, such as with a cube, the measurement can be biased by your extrusion parameters and z-offset/bed leveling. For instance, if you are overextruding, it will add just a little too much flow to the walls, making them thicker, which will change the dimensions of the cube, but not the steps/mm. The same wall thickness offset will be present for a 1cm cube or a 10cm cube.
So, instead of printing a >10cm cube and hoping the over-extrusion is negligible, you can measure multiple locations on a smaller calibration standard. By taking multiple measurements and performing a