This is a really simple minecraft steve head keychain that I threw together.
Scroll down to see how to paint the cube
32x32x32 mm (every pixel is 4x4 mm)
Design by me in Fusion 360
As long as you don't use supports any settings you like should be good.
Finished projekt(I was a little sloppy)
Masking for the white eyes
I made a couple 8x8 masking papers, where I cut out holes matching steves head parts. These resemble all the pixels which makes it a lot easier to paint (it also looks much better too).
After that I used an IWATA HP-CS airbrush to paint the pixels, and repeated the same thing over and over again around the head.