I made a scanner from the printer I made earlier. I drew a test page and also scanned a print I made on the same frame from when it was a printer... re-digitized. It uses the color sensor. The digitized image is saved to the EV3 memory where I can download it on the computer as shown in the last image below. It's pretty crude but it's a good proof-of-concept I could improve on. Anybody else done this?