I have a cheap Canon Pixma MG5750, a Currys PC World purchase when I needed a cheap multifunction printer fast. Was handy at £45 (another set of genuine ink for it costs the same, go figure) but obviously I never expected it to be perfect.
Unfortunately, one of the fundamental requirements of any printer - to be able to take in paper successfully - was a little lacking with this unit. Resarch indicates it's sadly a common issue with this range of Canon printers.
Soon after buying mine, the paper feed (take-up of paper from the tray into the mechanism) started to behave irregularly; soon after that I ended up having to nudge each sheet of paper in to the printer, it was unable to take in paper itself. Not convenient.
I put up with this for a while but an attempt to print some documents evening pushed me into investigating. The fix, as it turns out, is really simple!Click to read more and see photos of the paper feed roller fix