Scientists are 3D-printing human organs in space

Technology Nov 11, 2025

ETH Zurich scientists just pulled off something pretty wild—they 3D-printed muscle tissue in microgravity.
By using a special bioink and the G-FLight system during parabolic flights, they managed to get muscle fibers to form in ways that just aren't possible on Earth.
This is all part of their bigger goal: building human organs from scratch, using the unique conditions of space.

This could revolutionize organ transplants

If this tech keeps moving forward, it could totally change how we do organ transplants—think fewer people stuck waiting for donors.
Plus, it might help astronauts stay healthier on long missions by tackling muscle loss caused by zero gravity.
The team's next steps? Working toward printing artificial hearts in space.