My remix differs by adding more wires and making the spring extension type and more strong.

I was looking for extension spring that strong enough and has good load distribution. 3d printed flat springs seem too sketchy and looks like nothing better than usual coil spring can't be found. But for printing on it's side it has to be flat on one side to have enough bed adhesion so hexagonal shape works. But if only 1 wire used there is not enough strength. So I used 3 and I got relatively small spring that can hold 1-3 kg before breaking. 

This model was just a test and you can use it for your projects.