Canon Selphy CP500
Trusted Reviews has a good review of the Canon Selphy CP500 and writes - ‘You might expect a printer like this to be virtually silent in operation, and the printing process itself is little more than a slight crackle as the ink is transferred from the carrier film. Driving the card backwards and forwards for each pass of the print head, though, involves a high-pitched whine from the feed motors, which is at an annoying pitch and was measured at 59dBA - not quiet….
If you want a printer specifically for printing photos and are never going to want to print above 6 x 4-inch prints, the Selphy CP500 is cheaper to run, quicker to print and produces higher quality images than any inkjet photo printer we’ve yet seen. It may be unconventional, but it does a great job.’