[COGlory]

Unless the design has changed, there is a pad that absorbs overflow ink from cleaning the print heads. After some time, that pad will be full, and then the printer will refuse to ever print again.

I've now had 2 Pixma G series break that way, with a third well set on that course.

[OliverJones]

I cleaned one of those overflow pad assemblies once, on an old Epson. I got several more years out of it. But what a disgusting job cleaning it was. It's a great huge tank with many layers of pads. Do they sell replacements? One guess.

[COGlory]

They don't sell replacements, although I've heard of people DIY-ing it. However, the far bigger issue in my opinion is that when the printer detects that the absorber is full, it throws an error code (5B00) that prevents the printer from functioning, and can only be reset by the manufacturer.

I have yet to get a full tank out of one, and very much regret buying them.