Customizable (ventilation) cover for round hole

Customizable cover for round holes.

It can be used to cover holes, line the edge of holes, reduce the size of holes, basically anything you want to do with a round hole.

I made a custom plexiglass lid on my daughters aquarium. I used this tool to make the:
- ventilation covers
- lining for feeding hole
- lid for feeding hole
- knob for feeding hole lid

For closed cover set size mesh to 0.
For open cover set mesh size to 999.