The OpenFlexure Microscope is an open-source 3D-printed microscope, including a precise mechanical stage to move the sample and focus the optics. There are many different options for the optics, ranging from a webcam lens to a 100x, oil immersion objective.
The trick of making a microscope out of a webcam has been around for a little while, and produces good results. However, getting a nice mechanical stage to focus the microscope and move around on the sample is tricky. This project is a 3D printable design that enables very fine (sub-micron) mechanical positioning of the sample and the lens, with surprisingly good mechanical stability.
Here are links to articles for your reading pleasure. You may also submit brief reviews or discuss the contents of the articles.
https://openflexure.org/projects/micros ... afVM4_7H8c