Under mattress cup holder

thingiverse

Cup holder for holding a 40oz water bottle to the side of my bed. It sticks under the mattress to hold it in place. It turned out too flexible between the mattress and the ring that holds the cup, but as it turns out, I put it between my bed and night stand, so even though it's a little too flexible, the water bottle doesn't have anywhere to go as it tries to lean out from the bed. So it works well for me. I probably won't bother to fix the flexibility, though some small ribs sticking up along the surface from the ring towards the mattress would probably stiffen it right up. The printer I used is a CR-10 MAX, which isn't in the drop down yet, so I chose the closest thing.