Paper Pixel Display Array

This is the first test with one unit, I 3D-printed the rollers and they are a bit slippery, so i need ti find a solution for that, any ideas?

All the wires run through a pocket cut in the acrylic sheet so they do not interfere with the pixel loop of the next unit

To make the pixel loop go round and drive it from the inside there is a gt2 belt running along all four rollers.

The strip used as a closed loop has 32pixels in two rows which when taped together can display all combinations of 2x2 black and white pixels. If someone can make it more efficient let me know.

Before the closed loop version the previous version of the display had two strips wound around a single tube (bit like a cassette tape) with a gear in the middle to drive it. I thought the tension wouldn't be much of a problem considered its a fairly short strip, but at the ends of the strip it was to tight.