I was reading some research papers on inkjet printing organic devices.
Like alot of people here, they have problems with the ink spreading
before drying is complete. One thing that is done to minimize
spreading is to heat the substrate(board) to make the ink dry faster.
An example paper is
http://www.eecs.berkeley.edu/~viveks/Papers/H8_3MRS03.pdf, but
the technique is mentioned in serveral papers.
There are some issues with the technique such as causing excessive
evaporation at the printhead, but it seems there are ways to work
around it.
I do not have anything setup to do this kind of experimenation myself,
but it may give someone else some ideas.