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Solsylva has an interesting DIY rotational molding, or casting, machine used for hollow casting of resin or any other material that does not require heat activation. I like their idea of using a rotisserie motor, since I think it is fairly easy to find an unused one for free. Although, a hand crank would work for quick drying resins. – Link

Marc de Vinck

I’m currently working full time as the Dexter F. Baker Professor of Practice in Creativity in the Masters of Engineering in Technical Entrepreneurship Program at Lehigh University. I’m also an avid product designer, kit maker, author, father, tinkerer, and member of the MAKE Technical Advisory board.



  1. johnrdupree says:

    I’m so glad I saw this. I’ve been trying to figure out how to build a rotating rig for cleaning and coating the inside of rusty motorcycle gas tanks. This is exactly what I need.

  2. Marc says:

    Great! Don’t forget to take some pictures when you are done, and sent them in.

  3. ron39 says:

    David (aka solsylva) also has plans for several DIY CNC machines. See the forums on to find people who’ve built from them. I built the belt drive CNC and am quite happy with it. You can see some video at