Spring endcap for Bertho extruder by fantom

3D Printing 3D Printer Extruders

Spring endcap for Bertho extruder

fantom

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Published on October 23, 2012

Description

Bertho's extruder (Thing 26094) is a great improvement for the ultimaker which requires a pretty solid spring.

The one I got happened to have a diameter of a little over a centimetre, and when you place this around a 3M bolt it can easily move off centre.

This 'end cap' is designed to thread over the 3M bolt and surround the end of the spring to keep it centred.

Simple parametric script incase anyone wants to fiddle to fit a different sized spring.

Instructions

Print 2 and place them around the spring for your extruder :)

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Polymorph on December 9, 2012 said:

You say that your spring has a diameter of a little over a cm, but in the SCAD file it says 19mm for width and in the photo of your completed project, it appears the spring is just about as wide as the adjacent part of Bertho's feeder upgrade, which is itself about 19mm wide.

I'm new to using OpenSCAD, so I'm finding this a bit confusing.

So in the SCAD file, w, which is 19, is the diameter of the inside of the lip?

Thank you for making this file. My only spring close to small enough is too weak. I bought a few springs at the hardware store but all that are strong are about 20mm in diameter.

Polymorph on December 9, 2012 said:

OK, fiddled and printed, 19mm is the inside diameter of the lip. Printed one set with 20mm for a larger, longer spring I have and printing another at 17mm for a shorter, narrower, but much stiffer spring so I can see which works better.