CEO John Kawola is gesturing to the dozens of 3D printed components on Boston Micro Fabrication’s (BMF) RAPID + TCT booth. These parts, which range from electrical componentry to medical devices to microfluidic devices, have been additively manufactured on BMF’s microArch series of 3D printers, of which there are seven models. The parts are small – very small – and the printers are conspicuous in their absence.