NASA astronaut Christina Koch services a 3-D biological printer

iss061e093837 (Dec. 22, 2019) --- Expedition 61 Flight Engineer and NASA astronaut Christina Koch services the BioFabrication Facility (BFF). The BFF is a 3-D biological printer that manufactures organ-like tissues in microgravity and could become a part of a larger system capable of manufacturing whole, fully-functioning human organs from existing patient cells.