Warp in build plate?

[Bobbler]

Thanks for the answers.

I was looking at the glass plate at ff usa, one problem they wanted $150 in shipping to norway. So i better get one made here.

You can get Stove or Woodburner glass cut to size. Try your local suppliers they should be able to sort you out for not much money.
My local place (in the UK) stocked Robax glass which is basically a "branded" borosilicate glass.