Uploaded December 2021 | Updated September 2026, 2 weeks ago

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This is a mechanical dot matrix display controlled by a single stepper motor.

* It can show an arbitrary bitmap of 5x24 or 12x24 resolution, mechanically
* Perfect cylindrical shape
* All contents are scrolled up
* Used marbles (airsoft BB pellets) are automatically collected and reused
* Single motor control. The motor not only elevates but also arranges ON pixels
* Theoretically Scalable
* It keeps displayed contents even if the power black out or detach from the motor

resolution : 2.8 DPI (dot per inch) lol

3D data and sample codes are available at Thingiverse,
thingiverse.com/thing:5154001

related videos:
Full version, no fast forward : youtu.be/TOg5RNDzCaU
Sample application : youtu.be/H70IgdtJrQQ
Transparent easy-to-make version : youtu.be/DkVyGEvaI5Y

My works on digital fabrication:
shiura.com/dfab/index-en.html
Please subscribe my YouTube channel if you like!