With the rapid development of 3D printing technology in recent years

the material extrusion process to fabricate functionally graded materials has become a research hotspot. The transition between materials is the critical issue which affects the final molding quality. At present

only the transition distance between two independent materials has been studied by domestic and foreign scholars

and there were less research on the transition distance between materials with different components. The transition distance between different component materials was investigated by using a dual barrel printer

and through experiments to explore the influence of different feeds on the transition distance

the feed with the smallest transition distance was obtained under the premise of ensuring the print quality. Visual Studio 2019 was utilized as the development platform to propose a new feed strategy to shorten the transition distance

the materials information of the sliced points were judged in the path planning

for materials with increasing components

the feeds of two barrel printer were calculated based on the change values

and a new G-code was generated for printing. Finally

the new G-code was employed for printing experiments

which shorten the material transition distance and achieve the desired material transition curve.