Continuing with evolution of our printers to improve their print quality is possibly the most important thing we can do.
As we continue to work on them they will be listed as EVO which is essentially the next beta for printers. However as the printers are made to be modular in their construction it allows new parts to be interchangeable with current parts, thus evolution. Changes or improved parts will be tested and when happy with their performance they will supersede the current version. The criteria for a model change vs an EVO is hardware. As long as the same parts can be used with parts the printer stays current. Once a hardware change is made such as different bearings this would be considered a new model.