I Designed this because I liked the vertical axis style, but none of the current designs that I found would let you use current extruder designs.
This lets you use a Gregs Wade style extruder, and most anything with the same style mount.
Edit: I have redesigned the carriage bit to have holes for mounting different attachments.
There is now one that will hold a Gregs Wades style extruder, and one for mounting a dremel flexible shaft to it.
The top holes are spaces so a fan can be mounted to the carriage, or for extra accessory bits
I have uploaded the SolidWorks2012 files below, as well as the assembly and the support files as a rar.
Edit: Uploaded videos of this here
All LM8UU Bearings are attached with one ziptie. They shouldnt move when properly tightened.
All holes and nut traps are designed for 6-32 nuts/bolts, but I believe that M4 should work as well. Except the Z leadscrew and the Idler pully, which are for 5/16" or M8.
Print more things with it.
Here is a flickr set with instructions on how to assemble in the comments