When doing DNA origami to form lots of atomically precise nanoscale parts with different shapes/topologies there's the need to mix a lot of different combinations of a lot of different DNA oligomeres.
AFAIK currently for such large scale mixing projects robotic pipetting systems are used that are not easily accessible.
Microfluidic systems may have the potential to replace such huge and expensive robotic pipetting systems.
Here's some new work investigating in how far cheap FDM printing can be used for microfluidics.
http://journals.plos.org/ploso…1371/journal.pone.0152023