My daughter has one of these loft beds / bunk beds often found on Amazon or WayFair. I was worried about her falling down the stairs in the middle of the night on a quest for a glass of water or some tissues so I made this caddy to hang on the side of the bed. It can hold a square tissue box perfectly along with a water bottle and even a slot for an tablet to stand vertically. I used hexagons to reduce the filament cost (~305g), but it is still extremely strong @ 0.20mm layer height and 10% infill. Unfortunately you will need tree supports. Should fit perfectly for you if the “rail” you're hanging it on is about 18mm. About a 10 hour print.