In order to create a pneumatic artificial muscle, tubing for the inside must be created. In this demonstration a 3D printed mold is assembled and wrapped with Teflon tape (in order to seal the seams).
This video is to be used in a documentation set for Pneumatic Artificial Muscles as part of the Soft Robotics Toolkit:
The site: https://softroboticstoolkit.com
The relevant page: https://softroboticstoolkit.com/book/pneumatic-artificial-muscles