@Sean Hill, Yes I was noticing that the other day while assembling a new unit. In our original case we were only using that PCB for the LEDs. Since we replaced both the hot end and controller board, all the wiring had to be redone anyways. It made no sense to pass the connections through the end effector PCB at that point. However if you are still using the Brainwave then it would make sense to use the original harness. I'll consider updating the design to accommodate this at some point. Also, remember that you can't plug the E3D fan into that board anyways since the fan needs 24V and the board only provides 5V.