Comparison of Technologies: Ink versus Laser: Features: Paper Output
Annoying, if printed pages come out curled. This happens, if the paper was not stored properly or copy paper of inferior quality is used.
The fuser heats up the paper. This can cause curling, as you can see here with Brother´s HL-2150. This printer has no sensor, which stops printing when the output bin is full.
With HP´s Officejet Pro 8000 you don´t have to worry about curling. Paper is not heated in an ink printer.