The HP 2605dn series printer is a fairly popular colour laser for home networks.
It does suffer from two nasty "features" however:-
1. Toner Cartridge Pessimism
You can tell the printer to override the empty toner warning and carry on using it until you decide a toner cartridge has really run out.
2. Fading Red Toner
Turns out this printer has a design fault that causes dust buildup on the laser optics.
You can read more about this problem at the Reeves-Hall Family Website, though I actually used this pdf which is quite comprehensive.
Took me about 2 hours to dismantle the printer and effect the lens/mirror cleaning fix. 30 minutes to put the printer back together, and another 30 minutes to run the printer through its cleaning routine, calibration etc. and print some test pages.
I can confirm that this really does work - even if the dust coating on the optics looks insignificant!