MicroBeltTensioner (Customizable)

thingiverse

This tiny, adaptable belt tensioner has a remarkably low profile on the belt's movement. By default, the lost belt movement is about 23mm using an M3 screw and nut, but since it's fully customizable, you can shrink it even further if desired. If you like the design and want a more robust tensioner or more space for a bigger belt, that's also easily achievable. When utilizing the default components, you'll need a M3 nut and a 10mm M3 screw. Embed the nut into its matching hole, then place the clamp over it. Next, insert the screw from the opposite side. The belt enters from the screw side, wraps around the clamp, and returns to the side with the screw. For optimal results and minimal stress on the belt itself, ensure that the non-teeth side of the belt is facing outwards. By turning the screw, the clamp presses against it and pushes the belt outward. I used them on my TronXY X5 to tension both the X and Y belts. If printed correctly, this tensioner is incredibly robust. The FreeCAD source for customization is included as always.