Updated scads - re-oriented the idler slider for better printing, added in Doug's code to beef up the hotend clamp, secured the center of my hotend effector so that it'll be more likely to print properly.
Adding in the updated STLs.  Also, the hotend effector had issues with not being manifold - not sure where, so I uploaded the netfabb cloud repaired version.  Slic3r failed to slice the non-repaired one.