Comment by montalbano

Earlier iterations of this were used successfully as part of a water quality monitoring in Tanzania:

https://www.waterscope.org/about-us/

Richard Bowman (previously Cambridge uni, now Bath) was the main driver of these microscopes and is a great, highly intelligent person. Many other people have contributed to the project in small and large ways over the years.

Some other links:

https://3dprint.com/165457/openflexure-3d-printed-microscope...

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7249832/