For New Enclosure

[KMG]

What KMG said. Also, it's dusty. Bad idea. Just pop down to the local dollar store and find those smallish cat litter trays and cut a hole big enough for the snake to go through into them. Sand the edges to make sure they don't got any snaggy spots and you're good.

Cheap and easy.

Another way to round the edges is to kiss the rough edges with a lighter and rub them smooth. It just takes a second to soften it up. Very easy.