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I am having some similar questions regarding the bed size and offsets.

I'm going to be building the dual Z, and am getting a 400mm x 400mm bed heater. And a cast aluminum bed. My questions are:

I can see where I can put the dimensions in for the build plate. But it's not making sense to me.

If my heater is 400mm x 400mm (OK, maybe 420mm, I'll measure it when it comes in next week). Wouldn't the mounting holes be greater than 400 x 400? Otherwise, I'd be putting holes in the heater itself. Am I missing something?

With respect to the bed bracket offset, how am I to choose this? Is this where you add the additional 15mm to 45mm to the build plate size to accommodate the screws? What is the purpose of the difference offset sizes?

Thanks

Michael