My playtime as of making this post is 2190 minutes (36.5 hours)

I think it probably could've been made much more compact. Almost all the pieces are thrown together from modular parts I made and then assembled together. Despite this, I'm pretty proud of how it turned out, after a lot of trial and error and staring at wires. Very fun project :)

The top inputs are 4 sets of RGB dyes (colors are mixed dynamically based on the request), and the bottom inputs are all what I personally call "magic shapes" (any shape that has a corner of each type, circle, star, square, windmill).

The shapes are processed and painted as fast as I could manage it. It outputs 2 full belts of any requested shape, including missing corners, grays, or any amount of stacks.