Usb microscope

thingiverse

Try to create a microscope from an old USB webcam by turning its lens. Source: https://cad.onshape.com/documents/6d8d8da7212881ea0ea59d09/w/d9b6884b308dc513247c4a57/e/cdd47c63ecf22a6e840f5562 You can modify it to fit your own camera's board. Print the screw horizontally with supports, and all other parts vertically. The cheaper the webcam is, the greater the magnification will be since the matrix is smaller.