I would love to have a go at making something like this but suspect the friction focus will have it's challenges. I printed a working 300 micron pitch screwthread in vase mode which might be worth exploring for a focus mechanism.
Lucas Sifoni documents a pocket-sized, 3D-printed Dobsonian telescope built around a 76 mm mirror. The project details its compact mechanical design, materials, optical testing, and limits, showing it is small but genuinely functional.
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