Adjustable Y belt tensioner

by RobPRINT, published

Adjustable Y belt tensioner by RobPRINT Oct 26, 2012
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Fast, simple and easy Y belt tensioner!
No bushings, springs or multiple parts, just one part easy to mount :)


  1. Print the part
  2. Mount on the rod on the half way between Y motor and roller.
  3. Adjust belt tension with the inclination of your tensioner in respect to the ground
  4. Tighten with M3x20 screw and nut with washer.


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I installed this without even needing the screw/bolt to clamp it on the crossmember threaded rod. I thought it would fall off eventually, but it's still there. My belt is very loose, but this is making the y-travel accurate enough to make another Y-belt tensioner that will put more tension on the belt.

Doesn't this slowly eat through the belt? There is a reason they use roller bearings where the belt raps round the frame.

yes, it does, but very, very slowly. I'll upload second version of this thing which now includes bearing