3D Printed Bionic Nanodevices.

•Bionics involves the interfacing of functional devices directly with biology.•3D printing allows the interweaving of biological and functional materials.•We highlight the unique functionalities of nanoscale inks for 3D printing.•We highlight the 3D printing of microscale features from these nanoscale inks.•We highlight the hierarchical printing of macroscale bionic architectures.