The CNC machine made a grinding sound I’d never heard before, and I knew I’d just destroyed my third prototype of the week. It was mid-March 2016, and there I was in my garage, parts scattered everywhere, my patience stretched…

The CNC machine made a grinding sound I’d never heard before, and I knew I’d just destroyed my third prototype of the week. It was late on a Thursday evening, and once again, I was surrounded by shreds of defeated…