Spring endcap for Bertho extruder

by fantom, published

Spring endcap for Bertho extruder by fantom Oct 23, 2012

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2744Views 526Downloads Found in 3D Printer Extruders
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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.


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

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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.

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.

My Ultimaker prints holes a bit smaller than actual size, so I've also set the hole size to 3.1mm.

Sorry, didn't have time to reply between your 2 questions :)

I've found the required spring to be MUCH stronger than I was expecting.  I've no way of measuring the one I use now, but my first choice of spring turned out to allow far too much slippage when working at moderate (60) speeds.  My final spring is one that I can scarcely compress by hand.