Comment by fybs

you are right, I found the site watching this:

https://www.youtube.com/watch?v=9TYlQ4urcg8

- this is the microscope from the link. OpenFlexure Delta Stage 3D Printed Microscope: Hunting for Tardigrades

https://www.youtube.com/watch?v=eATcGuTz6To

- And I really liked this DIY

https://www.instructables.com/Low-cost-Fluorescence-and-Brig...