Unlevel Heated Bed or Glass

[addisonElliott]

Hello,
I have had my Rostock Max bed apart for a month or two now trying to upgrade the heated bed. Recently, I soldered a new thermistor and some 12 gauge wires to the heated bed and installed it back to the printer.

However, I am noticing a ~2mm gap when I place the glass on top of the heated bed. If I put the clips on, it fixes it a bit, but there are still places around the edges where its sticking up.
Here is a picture of the gap: [img]http://www.addipop.com/pictures/2015-08 ... .53.47.jpg[/img]

EDIT: After taking a drywall square to the glass and the heated bed, it is obvious that the heated bed is warped in the center. I did solder thicker wires to the heated bed, so it may have happened here.

Why did this happen and what could I do to prevent it in the future?

[Mac The Knife]

I believe Gene posted a solution for this, loosen the bed screws, warm the bed up to temperature, then tighten the screws.

[geneb]

You want to press the bed flat and keep it flat as you tighten the screws in the same pattern as spec'd in the docs. I don't think it needs to be hot in order to do this.

g.

[addisonElliott]

How difficult should it be to push it down? I have a toothbrush cup that I place in the center of the bed and then with one hand I am pushing down on it while I tighten the screws with the other hand. After tightening, I place the glass on top of the heated bed and it is still unlevel.

I even tried applying heat and using a level to see if I could get it level.

Could it be easier just to buy another heated bed and see if that is the issue?

[geneb]

If I was to do this operation on one of my printers, I'd put a coffee cup in the center of the Onyx and then set an old bowling ball I have on to the cup, then I'd go about tightening the screws.

g.