Every now and then you can see crewmembers carrying paper manuals or notes around. Is this all pre-printed on earth / handwritten or is there actually a printer on the ISS?
Yes, according to Robert Frost , NASA Instructor and Flight Controller, the ISS has a Epson Stylus Color 800 mounted on the aft wall of Destiny.
Epson Stylus Color 800 from 1996
The printer is also visible in the International Space Station Panoramic Tour provided by ESA.