Made from scratch. But was inspired by the Prusa and i2 version to make a i3/i3 Rework version. Which has a different spacing. By clamping down the rods, you will be able to tighten the GT belt much tighter. Without damaging the X-ends and also keeps from bending your X-Axis rods. You will need to print two, each placed against the left and right X-ends. If you want to have a tight belt, I suggest you print a X-end IDLER with belt tensioner.I used Autodesk 123D Design to make this piece from scratch. I have added the source file for your pleasure :)