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Parameterized printable spring

by obijuan, published

Parameterized printable spring by obijuan Apr 12, 2012
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Summary

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

Instructions

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

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Is the spring strong enough for a Z Axis anto backlash mod?
I only have PLA at home. can I print it in PLA?

Great script and design! After one failed attempt at coming up with a 3D-printable spring design, I found this. Works great!

What infill do you recommend? Any at all?

great concept. Do you think it is possible to print springs for the extruder bearing bracket?

no. you need stronger springs then plastic, stronger then inc pen spring.

This is really nice Obi Juan! What plastic are you using for this?

Thanks! It was printed in ABS

Could you generate stl examples to use it in my Prusa Mendel Z Axis??? Thx!! I would appreciate it a lot!

Download the spring.stl file. It should work for Prusa. But it is rather difficult to print

You should post a video of these springs in action.

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