alt Hacker NewsIf you read the 2 year old discussion linked in comments here, the owner said that the drawings on the actual website are all manually scanned by hand. So those are probably filtered. However, the YouTube livestream of the printer is not filtered. Basically it will print whatever but your drawing may or may not show up on site.
The current live feed image, of an F-word political statement directed against 5 different named parties, shows impressive penmanship.