The linked video is about the open source 3D printable "Portable Upgradeable Modular and Affordable" (PUMA) microscope. The channel has several videos explaining fundamental concepts in microscopy and showing practical examples.

The github is here: https://github.com/TadPath/PUMA

The microscope can already perform many types of advanced techniques, and it is still being actively developed. The git states that the author is currently working on a motorized XYZ precision CNC stage. These precision stages are usually quite expensive, and they are very interesting because they enable some scanning microscopy techniques.

I am not associated with this in any way, I just watched a few videos and found them interesting enough to share.