Please watch this short video about fixing a mistake when cutting speaker holes.
https://www.youtube.com/watch?v=-kzahuLWme8
Did this guy guide his work piece in the wrong direction? May be safe for soft wood like MDF but could rip the piece out of your hands if cutting plastic.
I have more HDPE rings to cut. Some are under sized. I was going to try his technique. But just want to be safe. I've had some pieces fly out of my hands. The router bit could have grabbed my fingers.
Ge0