In this study, a numerical framework based on the material point method is presented for the simulation of material extrusion (MEX)-based 3-D printing processes. The melt flow during material extrusion is assumed to be viscous flow including phase changes. To apply the free surface boundary conditions, the framework utilizes the level set method to track the free surface and the ghost fluid method for the application of the boundary conditions. For validation, three representative problems are first investigated to show the versatility of the model. Then, the numerical framework is adapted for the simulation of material extrusion (MEX) based 3-D printing processes. An in-depth parametric study is presented to show how printing parameters affect the overall extruded printing material.

在这项研究中，提出了一个基于材料点法的数值框架，用于模拟基于材料挤出 (MEX) 的 3D 打印过程。材料挤出期间的熔体流动被假定为包括相变的粘性流动。为了应用自由表面边界条件，该框架利用水平集方法来跟踪自由表面，并利用幻影流体方法来应用边界条件。为了进行验证，首先研究三个代表性问题以显示模型的多功能性。然后，数值框架适用于基于材料挤出 (MEX) 的 3D 打印过程的模拟。进行了深入的参数研究，以显示打印参数如何影响整体挤出打印材料。