It didn't make a sound. It didn't vibrate. It just spun, picking up speed. Silas watched the tachometer on his workbench as the RPMs climbed. 1,000... 5,000... 50,000. According to the laws of physics, the centrifugal force should have ripped the object apart. Instead, the air around the device began to grow intensely cold, as if the spinning gears were drinking the ambient thermal energy of the room to power their impossible motion.
Usually, this would just export a file to a 3D printer. But as Silas clicked the button, the air in the workshop grew thick and heavy, smelling of ozone and fresh rain. The laser in his industrial metal 3D printer in the corner clicked on without being connected. It didn't melt plastic or metal powder; it seemed to be knitting together threads of pure light right out of the empty air of the build chamber. inventor advanced tutorials pdf