Custom design 450 class RC helicopter. Designed to use align components from any 450 class bird. Recess in side frame is designed to fit the Tarot zxy FBL controller. I have assembled this model and can verify fit. It has yet to be flown as I am waiting on a new tail control rod. Can be printed from PLA or ABS. I chose PLA for its strength and rigidity. Frame is printed using a 40% infill but bearing blocks and motor mount are 100% infill. Use frame spacers from plastic motor mounts or bearing blocks found in the align 450 sport frame for holes in my motor mounts and bearing blocks. Just uploaded the files for the stock 450 pro tail block. I had a hard time printing the tail block and keeping the dimensions correct and I didnt have the hex shafts for assembly so I just purchased one from hobbyking.com