Reference layer resolution cubes 0.04 - 0.4mm

I made these 20mm x 20mm x 20mm cubes to give a quick visual reference of the different layer resolutions, height or quality that my ANET A8 is capable of. From https://3dprint.wiki/reprap/anet/a8 with the pitch of the Z axis screws and the number of steps per revolution from the stepper motors, the ideal layer sizes for the A8 are : 0.04, 0.08, 0.12, 0.16, 0.20, 0.24, 0.28, 0.32, 0.36, 0.40mm