Interesting 3D model! I printed the model in two pieces and glued them together, the threads as one piece and the top with the three cones as the next. In Flashprint software I had to scale the model up 2500% to get good size. Two cones rotate while one is stuck. There is a small problem/challenge with the tip of the inner axle in the 3D model. The lower part on the axle tip, the flange shape, will be free floating during printing for several layers and it may move around during this time. If it happens the rotating cone can be merged, or worse it can come out completely and get stuck somewhere else and mess up the print. This is my experience with the model if you want to do future iterations. I really like the finished piece! Oh, I haven't printed the tool joint box piece yet so I don't know how the threads will work. It would be cool it that piece was a bit more real looking.