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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?