Invisible Bookend

Hi, I had many books that were just to heavy, but at the same time to thin to stand on their own to, which caused smaller books to fall over. In addition, this is a great way to keep paperback books from opening while standing on the shelf (as shown with my copy of "The Will of the Many"). This Bookend is nearly invisible if you position it between the second to last and the last book on your shelf. I provided a couple examples on how to use this bookend in the pictures. Hope you like it! ... If you want to print in PLA, I recommend printing with 3 walls,