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.
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