The design is an extension of Zarquon's Game Card Holder
The design is an extension of Zarquon's Game Card Holder, which is itself a derivation of condac's Game Card Holder. 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.
Hacktastic blog: mathgrrl.com/hacktastic
Shapeways geekhaus store: shapeways.com/shops/mathgrrl
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