[Mathew]

Another interesting observation is that even though the principle of 1-L is perfect... The actual model itself as printed in 1-L actually has a small flaw. Because the primary hinge itself is slightly away from the secondary hinge, the primary hinge will pull it into the inclined plane as it makes its motion. But if the hinge and secondary hinge was exactly on the same pinpoint location the model would work perfectly and create a perfect sphere. All about controlling that arm from its ballsocket.....