Water bottle cage for your bike. These weigh about 30g, which is lighter than my cheap wire cages. I've been using various ABS prototypes of this design for several weeks. I doubt that it will last as long as a metal or carbon fiber cage, but the materials cost should be around $1, so you can afford to replace it a few times and still come out ahead. I don't think it looks too bad either.
The most up-to-date files will always be at the 3d-water-bottle-cage github repository.
cage-in-place.stl | 493.1KB | |
cage-print.stl | 524.7KB | |
cage.scad | 7.7KB |