There's a Digi-Compesque marble computer on the market at present, the Turing Tumble. <a href="https://www.turingtumble.com/" rel="nofollow">https://www.turingtumble.com/</a> Offerings include the CAD files for $15 US <a href="https://store.turingtumble.com/products/virtual-pack" rel="nofollow">https://store.turingtumble.com/products/virtual-pack</a> .