I've got an Epson Ecotank ET-7750 and really like it. (I'm kind of partial to wide format printers because schematics printed on them are easier on the eyes).

That said, a really interesting startup would be an open source inkjet printer. (All the necessary patents have expired ones that are current revolve mostly around cartridges or cleaning systems). I suspect it is a kind of niche market as my kids tell me that "nobody prints things, we have it on our phone!" which I kind of understand, but point out you don't need multiple monitors to do code development if you have listing printed out :-).