Prusa Y-axis belt tensioner
by chrille, published
The holes have the same spacing as the original belt clamps, so you should be able to simply replace the existing clamps without drilling new holes.
The tensioning bolt can be reached with an allen key even with the build plate mounted on top.
Sorry for the SketchUp design. I haven't taken the plunge into parametric modelling yet...
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You can make this work underneath. Just flip the whole assembly over. Put the small clamp piece right on (well, under) the MDF, then put the large piece beneath with the opening facing down. This aligns the belt pretty closely with the idler pulley on my machine.
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2. Clean up if necessary
3. Insert captive M3 nut
4. Bolt the two parts to the plate, so the bottom part has the belt slot facing down towards the plate and the captive nut is facing towards the middle of the plate. The top piece should have the teeth facing down, grabbing the teeth of the belt.
5. Screw in the M3 tensioning bolt (I used a 25mm one)
6. Adjust the bolt till you get the tension just right
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