This is a calibration test for the 3dprint colorizer system, which you can add to your cartesian printer from here: https://github.com/Sakati84/3DPrintColorizer
You'll know it's calibrated right when the painted square doesn't go out of the bounding bars on the sides, make sure to set the middle square to a virtual extruder that's a pen.
The author hasn't provided the model origin yet.