In the page describing "additional devices" for EPM (using OpenGrabber v3), it is mentionned a "protection case"
Where can I get this protection case either for buying either for getting the 3D model for me to print it?
The part you refer to is a customizable component designed for attaching the EPM to different vehicles. You can reach sales at erlerobotics.com requesting a customization. They'll help you figure out how you can get it.