Tissue Box Car Caddy

I have kids, they sometimes need tissues. The tissue boxes would always slide around on the seat, and eventually fall onto the floor. I made a caddy to hold the tissue box, with flat sections that can slide between the seat and seat back so that it can be held in place. The flat sections are hinged because when it was just a flexible flat thing, the front corners of the box would leave odd marks on my seat. Furthermore, if the armrest is down, it can hinge down behind the arm rest so that it mostly stay in place. I say mostly because the gap between the arm rest and the seat back is wider so if you drive spiritedly in the corners it can slid out. Yes I could have made a textured caddy, but I found that unless you have some heft to it, you need to use a more rubberized material, and I didn't want to do that because I preferred PETG. It's all print in place, and the way I designed the hinge, you really won't have to break a lot loose to get it hinging (is that a word? It look