Although it has been updated I liked this original design. As stated in its documentation you need to adapt it for your own use. I needed it for a MakerBot with an MK4 hotend. I know there a few adapter plates out there but I decided to go for an integral design. I had been using a Brutstruder http://www.thingiverse.com/thing:4036 which in turn uses Zaggo's Printable Extruder Holder http://www.thingiverse.com/thing:1912 and having good luck so I decided to go along these lines in adapting this.Additional info on this and driver circuit board at: http://bot719.com/No real additional instructions. Just use this in place of the main body of the original. I also made some small riser blocks to gain back some z-axis range. These are visible in the photo but not added here.