So updates on this printer. I've been using it since I got everything "finished" (like any good project it's never really finished). The dual extrudes have been a PAIN to work with. It's nearly impossible with my current configuration to get the two heads even at the tip. Even after shimming and getting it right, as soon as you change out the nozzle(s) it's thrown out again. So back to the drawing board! And while I'm at it i've decided that I hate the motors being mounted on the head. Not only do I have to slow the printer down to accommodate for the added weight, they chew into my usable print area by sticking out so far. So the next logical choice is a bowden set-up....oh heck no! Nina flex is still one of my favorite filaments to play around with and that's just not going to happen with a bowden. So I'm embarking on a journey that few had ventured so far...a flexible drive cable. And I know what you're thinking already, "what about torque flex in the cable?" Excellent question Gary. I'm going to attempt to mitigate the flex by using a worm gear at the drive end. I 'm hoping that any flex that does happen will result in so little movement at the extruder gear that It will be inconsequential. But only time will tell, so stay tuned for the next leg of the the Gli3DR build as she goes under the knife yet again!