It sounds to me like you don't have the original extruder, but you've got one of the (better) follow ups. If I understand, these extruders follow their own path and are largely interchangeable, and they aren't necessarily tied to a particular Prusa version.
In your situation, I'd avoid the wiki, and use YouTube and photos and forums to figure what goes where. The extruder designs are complicated and really cool, but what they do is really conceptually simple. You got this.
First things first, let's figure out what you have. Is it something like this:
[
www.thingiverse.com] ?
If so, check the comments on that item for a link to someone else's instructions. And photos tell most of the story. The basic idea is filament gets lightly squeezed between the hobbed portion of the bolt and a 608 bearing. A little gear on your stepper turns a big gear with that bolt, and the hobbed bolt makes the filament move. If you make that happen, you'll have a functional cold-end.
Let us know if you have any questions. If that link isn't what you have, a photo could go a long way.
Edited 1 time(s). Last edit at 02/06/2013 11:39PM by Karmavore.
