Yep. It's more or less the thinned down machined version of the effector mount I printed. The Problem is the barbells are the same distance from the center of the hotend as what I've got. In order to get my full build plate without hitting the towers I need the barbells to be mounted the same distance from the hotend center as the mag balls would be mounted. With the way the smart effector is designed for the electrical connections, I would need to design a mount that puts the barbells far enough above to not interfer with the wiring, thus lowering the z height even further. If I mount the barbell underneath the effector then the arms hit the smart effector before they hit the tower.
The Magballs seem to be the best compromise between build area and height. I like the fact that the ballcups have the springs for backlash compensation and won't come unhooked during a print versus the mag ball arms. Would it be possible to get mag balls the same diameter as the balls on the Barbells and use the ballcup arms with the stock mounting location on the smart effector?