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PG52′s Lego Spirograph (website is in French) sports four speeds for the board rotation and four for the arms. I love the complicated gearbox that enables the whole operation to run off of a single motor.

John Baichtal

My interests include writing, electronics, RPGs, scifi, hackers & hackerspaces, 3D printing, building sets & toys. @johnbaichtal



  1. JJ says:

    I had a bit of phase with these machines a few months ago. This one is nicely implemented, I like it a lot.

    Another good version of it that got me interested on them:

    There is a lot of information about this machines spread around the internet, unfortunately I still haven’t got round to putting together all the links I found. They are fascinating to watch, I find them quite hypnotic.

    I made a simulation of the machine using MATLAB:

    It’s good fun playing around with the parameters (eg speed, length of arms). The code is available on MATLAB File Exchange. I plan to turn it into Python code so it’s more accessible to others.

  2. Does anyone know what drawers those are in the background? I’ve been looking for a similar configuration (tiny drawers, but many of them) for ages now.

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