This extruder mount turns the motor 90 degrees to reduce the inertia of the stock mounting system. This also allows for easy access to the filament guiding hardware. The motor mount shown is setup for using the aluminum printrbot extruder (such as those you can find all over ebay) or you can find models for the extruder here and print out your own. This is also showing the E3D Lite 6 hot end. I will not be including a printable hot end holder. I highly recommend purchasing the aluminum printrbot holder (or print this: http://www.thingiverse.com/thing:615984). This is designed to accomodate a 10x10 cable chain as shown in the photos.NOTE! There are two bearing holders included. The one with 'bushing' in the title is for bronze bushings 8mm id x 14 mm od x 20mm long. The other bearing holder is for the stock lm8luu bearings that come with the 2up.This will mount directly to the stock bearing assembly or you can download and print any one of the many bearing assemblies. Take note, however, that you will need to use nuts on the back side of the bearing assembly.