It is a proof of concept of a kind of printable spring. Initially I designed it for using in my Prusa Mendel, because the z axis springs were very difficult to find for me. Then I generalized the idea and parameterized the spring.

These springs conceptually consist of a strip of plastic that is bended. The outer cross section of the spring can be square, hexagonal or octogonal.

The spring parameters are:

• fid (fold inner diameter)
• folds: Number of folds
• th: strip thickness
• Drill: Drill diameter
• Diameter of the outer cross section

Here there is a video of the proof of concept: http://www.youtube.com/watch?v=dbjiXFEyg_E

1.- Download the spring.scad file. Change the spring parameters and generate the STL 2.- Optionally you can just print the 3 springs given as examples 3.- I have used slic3r for slicing it. If the spring is small, it is quite difficult to print it. The easier springs to print are the ones with a square cross section. 4.- Print it! 5.- Before using it I had to file and clean the spring