While this part is pretty specialized, I needed one for my fleet, see the summary for the model it fits. https://www.thingiverse.com/thing:4718094
Super cool! I had a similar need while I was test/printing shell kits. I just didn't have a mess of MT couplers laying around so I did a static one as a "stand-in" to check coupler mount positioning. I'd like to give it a little more detail now just to see what I can get away with. MT on right, home brew on left. Mike