On-demand production and rapid manufacturing are named interchangeably, but there is a subtle difference between the two. On-demand production means a part can be printed fast when there is a need or demand. Rapid manufacturing means a part is printed fast because there is no longer a reason for which the part gets delayed. Thus, rapid manufacturing implies a single part may not be printed fast, but parts are printed fast, while on-demand production implies a single part can be printed fast, but many parts must not be demanded. While on-demand production indicates urgency, rapid manufacturing indicates a paradigm shift.