I'm no longer using this mount on my printer, and you probably shouldn't either.* If you want to use the E3D with the 3DR Simple, I recommend using this new platform I designed along with this E3D mount. This is the approach I am currently using. I'm retaining this object for historic purposes only. Below is the original description: This thing allows you to use an E3Dv5 hot-end on your "RepRap 3DR Simple" 3D printer. May also work with the E3Dv6, but I haven't tried. Also features captive nuts for the screws holding it all together. This allows you to be able to use slightly more common 20mm M3 bolts instead of the 22mm bolts specified on the BOM. It also makes it easier to put together securely. :)