Automatically split baseplate size according to printer bed size

[jottr]

I want to print a baseplate that is larger than my print bed. Currently I have to split the baseplate into two printable parts, that are screwed together. This results in wasted space, since the grid is not utilizing the available space optimally.

Example render of the problem:

It would be very useful to have two variables print_bedx and print_bedy, and then offer an option to automatically splitting large grids.