Evidence from current literature indicates that three-dimensional printing with iron and iron-based alloys (such as stainless steel) is feasible for space applications, though it faces technical challenges like modified melting behaviors in microgravity.
The claim specifies that 3D printing with iron is feasible in microgravity. Paper [0] explicitly lists iron among the metals studied for additive manufacturing in space, and Paper [4] evaluates iron-based stainless steel components produced via laser powder bed fusion for spaceflight use. Therefore, the claim is supported.