At first glance, biodegradable materials, inks for 3D printing, and aerogels don't seem to have much in common. All three have great potential for the future: "green" materials do not pollute the environment, 3D printing can produce complex structures without waste, and ultra-light aerogels are excellent heat insulators. Researchers have now succeeded in combining all these advantages in a cellulose-based, 3D-printable aerogel.