I guess certain delicate parts must be better done in zero gravity?

“NASA, Redwire and the Uniformed Services University of the Health Sciences Center for Biotechnology (4DBio3) are sending a new 3D printer to the International Space Station, Redwire’s BioFabrication Facility, to bioprint a human knee meniscus in orbit and study the result on Earth. Ideally, this will lead to treatments for the meniscal injuries that US soldiers all-too-frequently face.”

This is some great research.

Astronauts will 3D print part of a human knee in space