Code can be found on github: https://github.com/Eigenbaukombinat/glowboard (webserver.py)
IMG_2156 from Eigenbaukombinat on Vimeo.
The Glowboard Plotter plots images using 64 UV LEDs attached in a line moved over a 120cmx60cm glow-in-the-dark sheet by a stepper.
You could change out stepper motors for DC motors with encoders, and flash the LEDs once the band has moved a given distance. You can probably cut down a lot on motor noise.