**Contents**


Direct Writing Corrugated PVC Gel Artificial Muscle via Multi-Material Printing Processes Reprinted from: *Polymers* **2021**, *13*, 2734, doi:10.3390/polym13162734 ................ **159**


Reprinted from: *Polymers* **2021**, *13*, 2647, doi:10.3390/polym13162647 ................ **189**
