I am not sure what you are getting at. Do you think the pigment settles? I have an Epson 7600 and it seems to print consistently even after sitting. I now have a Canon ipf6100 and note that it occasionally agitates the ink which sits in reservoirs. It doesn't actually shake the carts.
Thank you Alan.
Yes, I'm referring to pigment settling.
This happens not only in the carts, but in my opinion also in the ink-pipes and probably in the heads.
I see color shifts on Epson4800, in particular when printing images containing BW (or near-BW) areas.
After some days of printer stop, the prints have initially a magenta cast, then it changes to a green cast, and after some prints it gradually return to initial gray tones.
Probably this happens because of the settling of pigments (magenta ink?), followed by ink with lower pigment density.
(Obviously I always print using fresh ICC profiles)
Regarding the ipf6100, yes it has an ink auto-shacking system inside the reservoirs (cartridges).
Epson 7900/9900 has a pressurized ink system, but I don't know if this can help to solve the pigment settling issue.