Concrete Business Card Holder w/ Neodymium Magnet & Steel Ball

This is a concrete business card holder that I have designed, open sourced, and now sell on Amazon under my brand Voidbox Industries.

It's angular design naturally leans back to allow the ball and your cards to align themselves with a set of three (3) 12x2mm neodymium magnets embedded in the back of the channel.

Documentation available at and is licensed under CC-BY-SA 4.0
[OSHW] US000129 | Certified open source hardware |

Posted on Jun 14, 2018

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