**5. Conclusions**

A layer-dependent analytical model is established to predict the layer-dependent processing parameters when fabricating the 07Cr15Ni5 steel on the CuCr substrate at the fixed layer thickness (0.3mm) and hatching space (0.3mm) and agrees well with experiments. Based on the research, the main conclusions can be drawn as follows:


The proposed analytical model provides a new guidance to determine the processing windows for novel multi-material components, especially for the multi-materials whose physical properties are significantly different. Nevertheless, the criterion for the good fusion tracks is based on the peak temperature of the molten pool in the range of Ts\_steel ~ Tb\_steel, which may not be a precise condition to determine the final process maps. More rigorous criteria related to molten pool defects such as pores and balling formation are to be identified to further narrow the process map. Furthermore, HS and m<sup>p</sup> also have a significant impact on printability during the fabrication of multi-material components, which will be discussed in the future.

**Author Contributions:** Conceptualization, methodology, and writing—original draft preparation, W.Z.; investigation, B.Z. and H.X.; writing—review and editing, project administration, H.Z.; funding acquisition, H.Y. and Y.W.; All authors have read and agreed to the published version of the manuscript.

**Funding:** This work is supported by the Human Spaceflight Program of China (D050302) and the Military Industry Stability Support project (2019KGW.YY4007Tm).

**Acknowledgments:** The authors would like to thank the Analytical and Testing Center of HUST for the SEM analysis and Jing Li for writing assistance.

**Conflicts of Interest:** The authors declare no conflict of interest.
