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Use the M8 threaded rod and two nuts on the ends. Supports for nuts are parameterized - modify if you feel it necessary.
UPDATE 19-09-2012: Parts slightly modified. Idler end fits F608 bearing. No bottom endstop - belt spreader instead.
UPDATE 23-09-2012: Modified idler end.
UPDATE 27-09-2012: Modified carrige.
After printing, remove the support cylinders covering the holes for the rods.
Belt tensioner for Rostock by lepko is licensed under the Creative Commons - Attribution - Share Alike license.
So what's this mean?
We're sure lepko 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!