Homebrew PCBs

It certainly looks like an interesting idea. The slit is 5 mils wide,
so it is within the range of what I would call machineable on a budget
(i.e. there exist end-mills down to 5 mils for $20-30). The only two
problems I see are mounting/aligning the electrode in the head and
applying the voltages. The voltages are most likely on the order of
500-1000V (based on my tiny knowledge of microfluidics so I could be
wrong). The electrode in the head has to be aligned somewhat close to
the center of the slit. This could be a problem because you'll have to
design something that holds your electrode and keeps out of the way of
the ink. Other than that it looks like a very cool idea.

CrazyCasta