This document discusses the potential for organ printing as an alternative to organ transplantation. It outlines some of the safety questions that need to be addressed, such as the risk of malignant cell transformation when cells are cultured ex vivo. Specifically, it notes that cells removed from their natural environment and placed in artificial conditions like culture dishes can potentially become immortalized or tumorigenic over time due to factors like prolonged culture or serum exposure. Maintaining patient safety throughout the development of technologies like organ printing will require careful consideration of these types of risks.