I bought some sheets of PE parts but some of them were accidentally bent a bit during the rough transportation... Not very badly bent, but the sheet is not flat any more.

Is there any good way to fix it? I tried to put it under something flat and heavy, but no obvious result. Any idea? Thanks!

It depends on how badly they're bent. You could try rolling the handle of an Xacto knife over the sheet. This will make it want to curl up, so you have to do both sides very carefully to make the curling tendency from each side cancel the other out. Practise on a piece of scrap first. You may also want to anneal the area first.

J

Thanks! It wasn't bent very badly, I think I will try to cancel the curl out by bending it back slightly. Good news is that the PE valid parts are quite intact and flat!