Homebrew PCBs

There was a company in West Hartford CT which was pioneering a piezo 
ink-jet head with extremely fine "resolution" -- Accent Color 
Sciences (now bankrupt).  There were a couple patents filed by them 
in 1999 and 2000 which describe the remarkable resolution of the 
print head.  Look under assignee name (AN/Accent) field in the 
advanced search engine at the www.uspto.gov   While there was a lot 
of interest from some of the cell phone manufactures, (if you wanted, 
you could change circuitry on the fly) the economy took its toll.