I made this shelf to fit right onto the side of my bed headboard. It is pretty sturdy though not very big, so it works best for holding smaller items such as other 3D printing projects, a phone while charging, or anything else of that size. I also reversed this design and printed one for the other side of my bed. I measured the size of the gap to fit just right with the bed, so it remains stable and never falls. I also included a mini backboard so items would not fall off the back of the shelf.