Hi.

I would loike to build a bigger heated bed than standard size 200x200.

I was thinking on a 300x200 and a 400x400 size.

How could it be done? Is there something already for sale?

Maybe a tuturial? I use mk2a but i need a bigger one.

Thanks in advance for any reply

Here's one that's 213mm x 320mm:
[www.ebay.com]

There's a new isis3d printer out with a 300 x 300 - [www.isis3d.net]

You can combine 4 standard-beds to one (400x400). I'm using an aluminum-platform that diffuses the heat from down below, so the building plate will be heated very homogenous.

I myself would etch a new board: [reprap.org].