Extruder using 6mm Burr instead of hobbed bolt for Prusa i3

I had no luck making a hob bolt, so this is a remix of a no-hob extruder idea I liked but instead of a dremel tool, my design uses a tungsten carbide burr 6mm shaft, 5/8"x 1/4" burr , Linbide SB-1MM http://www.linbide.co.nz/product.php?p=290 was about $26. It works perfectly and solved all my retraction issues. It was made with Tinkercad, my favorite design tool download the source and edit it if you need to to perhaps fit a different extruder, this one will fit a Budish or J-Head with a mount