this post was submitted on 14 Jan 2025
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This was done back in 2014 with cell phones, glass beads and 3d printers and the cost was under a dollar:
https://ceramics.org/ceramic-tech-today/just-bead-it-glass-spheres-form-powerful-and-inexpensive-cell-phone-microscope-you-can-3d-print-at-home/