friction used as 3d printed transistor/resistance[0]

graphite powder circuitry experiments[1a][1b]

simple transistor projects[2]

total pile high deeper math geek origami/kiragami mechanical approach[3]

pneumatic logic gates[4]; rotational logic gates[5];

gears/marbles/dominoes[6]

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transistor logic gates : https://www.youtube.com/watch?v=OWlD7gL9gS0

[0] 3d printed logic : https://hackaday.com/2019/03/02/3d-printing-logic-gates/

[1a] graphite circuits : https://hackaday.io/project/21622-graphite-circuitry-experim...

[1b] https://www.instructables.com/Paper-Electronics-Conductive-P...

[2] simple transistor projects : https://www.worldradiohistory.com/BOOKSHELF-ARH/Technology/A...

[3] : https://www.nature.com/articles/s41467-023-42323-1

[4] : a) https://www.instructables.com/3D-Printed-Pneumatic-Logic-Gat...

      b) https://www.youtube.com/watch?v=IxXaizglscw

[6] https://www.youtube.com/watch?v=kQeDnFUNW-Q

Ben Eater's channel is great: https://youtu.be/sTu3LwpF6XI