A world where we can 3D bioprint organs on demand is creeping ever closer to clinical reality, thanks to Belgian efforts to standardize the biomaterials necessary. Achieving this will have profound consequences for organ transplants, disease modeling, tissue engineering, personalized medicine, and drug discovery. But bioprinting success depends on multidisciplinary collaborations between material scientists, hardware manufacturers, clinicians, and other partners. Recently, these collaborations have reached the stratosphere, with a project to study cardiovascular aging with a heart-on-a-chip… in space!