the way g-codes work (in this project) is 1/10/u/-10/-1/# will print x 1-10, go up one and print x -10--1 and the finish(try it). you can also use SetColour/<insert colour here>/<insert saturation here>/<insert brightness here>/ to set the colour, saturation and brightness make a code here https://scratch.mit.edu/projects/1315783357/