Commit an extruder mount that touches on three points on the effector.

The only change to the effector is to make it a module and indent; the steve's extruder attachment then allows you to push the top portion of the hotend for the bowden version of the steve's extruder through the top.
![20130212_171559](https://f.cloud.github.com/assets/173611/156611/68189b04-769e-11e2-8ce6-e5faf749c19a.JPG)