Question: what is the most complicated and beneficial thing that you've made on a 3D printer?

Sarah Hampson answered on 7 Nov 2016:

A microchip that uses light energy to analyse particles & cells

It’s complicated because it has optical fibers inside, as well as lots of tiny channels that carry fluid around (instead of normal microchips that use electronics to do their jobs, mine use fluids), and a part that makes your particles/cells move in a single-file queue

It’s beneficial because it’ll hopefully help people to develop cheap (<£10) microchips that can scan cells and tell people if they have a disease or not