I made my previous design and it worked fine but i didn't like the fact they can tip over like domino's. So back to the drawingboard. 
I do markets myelf so i test everything myself. This design takes up less space, can not tip over and has an open back so you can stock your bookmark in there. Hope you guys find this a helpfull piece. I made it to print without supports. It's a big one but well worth it. 

I made mine from PETG so the profile is for PETG. If you're printing with another material you can choose whatever profile you want. It's a straight forward print. I also put in a model with a backplate on top.