There is a common question: Any issues running non-M3D PLA or ABS filaments? Many different people have tried printing with several different types of filament, but various aspects such as temperature, flow rate, motion speed, model configuration, etc. determine the difference between a successful print and a failed print. Most 1.75mm filaments can work, but there is no guarantee it won't clog the nozzle. Ninjaflex, for example, has worked before but there is no guarantee about performance or quality at this time. In the future, we will begin to test and certify various types of filaments that can work with the Micro.