The Helicopter Speed Limit - Helicopter Physics Series - #7 - Smarter Every Day 51. 4c9o virus. 3d printing with metal, titanium & aluminum demo by EOS @ MDM 2013. Shiral. Knotted Cogs. 3D Prints by mind eversion. Bridges 2012 talk: "Sculptures in S^3" Hopf Fibration 1. Octahedron Fractal Graph. Tesseract - 6 Rotations. Bioprinting. The impossible 3D Print v2. 3D-Printed-Labyrinth-Totem.m4v. Fractal Graph 4. Fractal Graph 3. Dodecahedron Chains. Developing Sierpinski arrowhead curve. Hilbert Curve.