Badge / ID holder to carry one or two badges. I didn't want the middle piece to be solid, so I added the Golden Ratio spiral and 2/3's grid referencing my other hobby: photography.

Parts are printed and glued together, I added small slot that helps guide for gluing

There are two parts, "Middle" and "Top/Bottom", print "Top/Bottom" x1 or x2 depending on how many badges you wish to carry.

Holds standard CC sized cards, note that the thickness of the opening is 1mm, some thinner cards may be loose, one of mine is, however the clip on the lanyard I use prevents it from sliding out.