What are the items outside of the Vex V5 kit that are allowed to use?

Hi everyone, I’m a member of team 65519A that just won the championship in Vietnam region. Me and my teammates are improving our robot. We would like to know what materials outside the VEX V5 kit can be used such as plastics, 3d printed objects,… and their specifications.

All materials that are allowed and their applications are listed in the Game Manual

Congrats on your win!