Aim at the selection of fused deposition modeling (FDM) parameters affecting the length of the fuse neck and the tensile strength of the molded parts in the future space processing and manufacturing

the fluid finite element software “Fluent” was used to simulate the stacking molding of microgravity FDM. The effects of the printing layer thicknesses

printing speeds and printing temperatures on the neck length of the fuse superposition and bonding under different gravity environments were analyzed

and the tensile strength of the FDM molded parts was analyzed in correlation.The results show that to increase the thickness of the printed layer will reduce the neck length of the fuse

and the difference between the microgravity and the normal gravity environments is obvious at 0.1 mm

which is 0.021 mm.The neck length is maximum when the printing speed is 60 mm/s. When the speed is too fast

the bonding effect of the fuse will be reduced due to insufficient heating

resulting in a reduction in the neck length.Microgravity will reduce the mass force of the wire

thereby reducing the length of the neck and reducing the tensile strength of the molded parts. The averagetensile strength is about 7.1% lower than normal gravity.