Canon BJC-3000 - Manual (Page 218)

218 Troubleshooting - Printout is Unsatisfactory
Printed surface scratched
The print side of the paper is scratched and stained.
Check 1 Are you printing on thick paper?
Check 2 Is the paper thickness lever set correctly?
Check 3 Are you printing on curled plain paper?
Check 4 Are you executing a high-density print on plain paper?
Check 5 Are you printing outside the recommended printing area?