Spirograph style Lego drawing machine (jkbrickworks.com)

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Fischertechnik also has a kit that can make a device like this: https://www.fischertechnik.de/en/products/toys/technology/57...

Posted this as I built it from the free instructions with similar lego technic bricks from my childhood. My kids love it :-D

One day I aspire to make a 5 stage geometric chuck and outdo the Science Museum's 4 stage model: https://theartinscience.blogspot.com/2012/11/the-original-sp...

"The Boy Mechanic" had an article [1] on building a "Wondergraph".

Googling the term will pull up a lot of examples [2] of this turn-of-the-19th-Century device.

[1] https://archive.org/details/theboymechanicvo12655gut/page/n5...

[2] https://www.aesculier.fr/fichiersMaple/wondergraph/wondergra...