The design is an extension of Zarquon's Game Card Holder (http://www.thingiverse.com/thing:15650), which is itself a derivation of condac's Game Card Holder (http://www.thingiverse.com/thing:15170). In this version Tinkercad was used to add tabs on the tops and bottoms as well so that you can make a grid for your cards when playing the Cities and Knights expansion game; if you order the cards as in the picture it can help you keep track of which commodities and progress cards go with which resources.
We're sure mathgrrl would love to see what you've printed.
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