GT2 Belt Tensioner
thingiverse
10mm GT2 belt tensioner but should also work with 6mm belts just center. You'll need to print a pair of these and also you will need 2-40mm M3 screws and nuts.
Download Model from thingiverse
With this file you will be able to print GT2 Belt Tensioner with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on GT2 Belt Tensioner.