This video shows him rather ham-fistedly interacting with a 3D model of a rocket engine assembly, then for some reason he goes on to show it being 3D printed.

This video shows him rather ham-fistedly interacting with a 3D model of a rocket engine assembly, then for some reason he goes on to show it being 3D printed. Anyone involved in using 3D CAD and component design, including using Siemens NX which he refers to in the video will have seen or used a six axis Space mouse controller by 3D connexion which costs a few hundred bucks and is massively more precise than using a leap motion. These space mice have been available for well over a decade and use simple optical encoders to derive translation and rotation. No doubt the leap motion has uses at and beyond the desktop but it has a way to go yet to overcome the problems in the algorithms for interpreting gestures at a distance.