Postcard display rack

A postcard rack designed for 148 x 105 mm cards (150 x 107 mm opening). 

I guess you can upscale and downscale it to accommodate for different card sizes. 

I included a version with a prusaslicer modifier to make your infill pattern visible on the bottom of the model (as it is on the pictures). Change your infill pattern and density to get it to look as you please. 

It is designed so that you can secure the “standing” card with 2 thumbtack and I included a thumbtack cover if you have thumbtack which are 10mm in diameter or less. I glued mine with neoprene glue. The slot for the standing card allows for up to 0.6mm thick cards.