Book Wall Shelf

Needed a book book shelf in my studio space that could hold soft cover books. This shelf is 9" deep and a little more than 7.5" tall. The angled sides support the base but also support the flimsiness of the soft cover books. There are 4 countersunk holes in the back for screws (the top two are probably enough). This is printed with PETG but could probably work fine with PLA. I have no real means of load testing this but you can see what I have in the picture. Under that load there isn't even any flex in the shelf so I think it could hold plenty more weight.