У вашего броузера проблема в совместимости с HTML5
Fast basic hinge design for 3D printing projects & small strength test. Print and test made using ABS plastic. 10x scale drawing and later down to 10%. Perhaps more knuckles make the hinge better with the same technique, just copying groups & flipping & pull tool. Decorate wings... Create some nice forms for the wings. This has minimal screw hole amount, so make your own.
Helpful plug-ins: Solid Inspector and CleanUp3.