While the hobbyist field of 3D printing has evolved leaps and bounds since 2009, it is still evolving fast. Things that are new today may be outdated in months? While some people find 3D printing and printers intuitive, others find the building, calibrating and adjusting very frustrating. That, and the fact that the actual printing process is rather slow, does not really lend itself to a fixed time, classroom activity. So many schools ran out and bought 3D printers that are now just sitting on a shelf somewhere. As a retired teacher, I know the frustration level of many of these printers in the classroom. A weekend class/intro might fuel interest in some teachers but is it not near enough time for them to master both the creation software and operation of most printers.