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I wrote this little headache-style OpenSCAD because I didn't have the right springs but a few ones from these:
(9 coils of 1mm wire diameter for a total lenght of 25mm with an 10mm OD and 8mm, ID)
Bearings were also an issue, the only ones I had where some scavenged from old milling cutting tools (5x9.5x3.2 or something like).
Unfortunatelly, there's quite some work after printing, check out the PDF for the details.
2x Flat Head Machine Screws are required for each spring I used M3x10mm, a little bit longer should be also ok.
For the bearing I also used another M3x10mm and due to the dimensions of those bearings I found, I also used 2x M3 washers (not to eliminate but to decrease the gap up to a minimum.
You shouldn't need the tubes/bushings/shells/whatever if you use the right bearings.
Do not force anything* or you'll end up breaking it, use the OpenSCAD (full of parameters) if something doesn't fit.
(*) The only place where force MUST carefully be done is to mount the springs.
The STL available for download are arranged in sets for 1 or 2 extruders (there's no left and right here).
A Few Bits for Emmett's Minimalistic Mk8 replacement by aubenc is licensed under the Creative Commons - Public Domain Dedication license.
So what's this mean?
We're sure aubenc would love to see what you've printed - take a photo and share it on Thingiverse as a Make.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. You can also download the Thingiverse Mobile app (available via Google Play and Apple App Store) to take a photo and upload your Make right from the app!