: If you're going to carve minicell with an angle grinder, and this
: works very well, do it outside otherwise it'll take you forever
: to get rid of the black dust inside your shop.

Correct. I figured minicell dust would get everywhere so I carved my minicell seat outside. I fastened it on top of a portable bench and carved away. Once in a while I would climb up on the bench and sit in the seat, feel the high spots, get down and grind some more. Repeat as necessary.
I probably took a quarter cubic foot of foam out of the seat and got fifty cubic feet of foam dust. It was a lot easier to sweep the driveway than clean the entire shop.

And wear a face mask. The dust is light and goes airborne. Static causes it to stick to everything, including you.

~Bob