I don't have the 3880, or any experience with one, but from posts I've read, it has a 'power clean' option that seems -again from the posts I've read - to do something of the same things as the 'Init Fill' Windows sw.
I understand that the Wic Reset now has an ink charge option that provides more powerful cleaning. (I'd be using it on the R3000.)
1. Does this exercise the Pk/Mk switch by default? If it charges using all nine cartridges, at some point it must.
2. If so, is there any way to prevent that, and...
Inkjet Mall now offers 60ml (!) refillable cartridges for the R3000. I haven't used them, so can't say how well they work. They do require removing the ink cartridge cover because of their size.