Onyx bed higher in middle

[jram]

Hello All,
I hope this is the correct area for this question, I searched but found nothing that addresses this issue. I am to the point in my build in which I am squaring the bed to the towers. When I lay a straight edge across the bed it's higher in the middle, looks to be around 1/32-1/64th lower on the outer edges. I have loosened my screws and then checked, still the same. Any recommendations? I've made sure that I'm not on the kapton tape and I'm using a dead flat straight edge.

[bot]

I don't know if the onyx bed is meant to be truly flat. The glass is what's important. Obviously surface contact suffers a little, but it's unavoidable I believe.

[Jimustanguitar]

Some others have said that if you loosen the screws and press down on the bed with a known flat object (like a level) as you tighten the screws, it will take some of this out. Bot is right though, the boro glass build plate is the stronger, flatter surface that should hold everything together.

[jram]

Ok, so I should just be sure that the square contacts the onyx plate in the middle even if it doesn't on the sides?

[bot]

I don't know, I didn't square anything to the Onyx bed... If I were to square the towers it would be to the glass surface on the onyx bed. I don't know what the new manual says, though.