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UPDATE Feb 2013: Well it doesn't print well with my 0.5mm nozzle. The wall where the hole is close to the side is too thin, see photos. I may try it scalled to a larger bolt size and play with slic3r settings a bit.
This is not a direct derivative of makerslide http://www.thingiverse.com/thing:8992 as it does not include the spacers.
This is based on the spec at http://www.buildlog.net/sm_laser/drawings/b18001_rev_3.pdf
I couldn't see why a metal one would be any better than a printed one. So I made one in SCAD.
I've also included a plain spacer to match.
It's also all zipped up for easy download.
The original STL of the Eccentric Spacer is at http://www.makerslide.com/
It and my version is for 0.281" 9/32" 7.1mm hole with a M5 bolt.
However you can modify easily for other sizes.
Shove in a 9/32" hole
Mount a bearing with a 5mm ID, using a M5 nut/bolt
Adjust the bearing to fit the rail mount using the hex section of the spacer.
Use the plain spacer to have idler wheels at the same height.
UPDATED Makerslide Eccentric Spacer - Parametric by MichaelAtOz is licensed under the Creative Commons - Attribution - Share Alike license.
So what's this mean?
We're sure MichaelAtOz 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!