[DIYbio] applications for DIY microfluidics

So years back, we all discussed DIY microfluidics like Sharpie
microfluidics. The stuff I've seen is just theoretical like mixing
colors to visualize the fluid flow. So what practical problems can we
tackle at a DIY level?

P.S. I just came across some an idea where the template is printed on
transparency film using a photocopier and molded on some polymer
(PDMS, maybe?)
http://www.gizmag.com/teacher-creates-microfluids-with-a-photocopier/17667/

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