XYZ test and calibration cube

thingiverse

I'm seeking a testing cube that displays which face is +x and -x, since I consistently forget to label these on my test prints. The X0 side embeds the X within its boundaries, whereas the X+ side positions it externally. Similarly, the Y faces follow this convention as well. Additionally, I want to incorporate an overhang test at the bottom of the cube. On 15.08.2017, I made adjustments to center the letters more evenly, as they were previously misaligned.