Prusa's ColorPrint tool

When 3D printing, there's usually a jump in cost and complexity for printers that can print multiple colors. As a workaround, you can pause the printer, switch the filament to a different color, print a few layers with that different color, then pause, switch filament, then resume printing. This can be a very tricky thing to do manually, so obviously, there is a tool to do it.  Here are some prints by a buddy of mine that utilized this tool for these prints. He prints a black surface with a cutout for the image, prints a few layers of a different color (glow in the dark in this case), then resumes printing in black. He didn't have to design the model with any major modifications, just the first few layers cut out so that the glow in the dark layer can shine through.