Parameter impact on 3D concrete printing from single to multi-layer stacking

Abstract

Previous studies have revealed that the design of printing parameters influences the filament shape, while the similarity degree between filament shape and modeled slice directly determines the precision of multi-layer stacking structures. This paper experimentally investigates the influence of printing parameters on filament shape and pressure along the printing path. Computational Fluid Dynamic simulation is employed to verify the experimental findings from the aspect of internal stress distribution. The results highlight the crucial role of printing pressure in connecting these parameters with filament shape. A settlement theory of the multi-layer structure is proposed and tested based the filament shape analysis. In practice, guaranteeing filament shape and adjusting printing progress can be achieved through proportional changes in nozzle travel speed and screw rotation speed. Controlling structure settlement is possible by adjusting nozzle height and time interval. These findings provide a solid foundation for the precise manufacturing of 3D printed structures.