Application of the Five-phase S-curve Velocity Model on FDM Three-dimensional Printer

The essence of the FDM (Fused Deposition Modeling) three-dimensional printing control technology is that the extrusion nozzle completes point-to-point motions by stepper motors according to a specified trajectory from G-codes. In the implementation of the G-code feeding, the stepper motor plays a very important role, not only providing power for the mechanical structure that drives the movement of the extrusion nozzle, but also directly participating in the control of the nozzle position. Allowing the speed of stepper motors to undergo a low-to-high acceleration process is a necessary process in the actual application environment, and the speed planning strategy will directly influence the molding quality and efficiency of the 3D model. This paper introduces the five-phase S-curve velocity model to control and plan the frequency of stepper motors and how to apply the model on the environment of 3D printer. Furthermore, the look-ahead algorithm is introduced to make the speed planning of multiple G-code paths more efficient. The experiment result proves the reduce on the effects of flexible impacts and the improvements on the surface quality of finished 3D models.