@vicious1 oh duh… I guess so eh… But I guess what I meant is so that the Y doesnt need to move the 300mm.. Let X move the extra distance.
I will be looking at it soon. I am very close to getting my CNC up and running for foam tests, then wood, then start cutting a larger printer. I am ok with sacrificing some speed for a larger bed. 300 x 300 would be even better. Seems like it should just be as simple as extending each axis by the same amount from the mid point, adding longer belts and rods.
Upgrading to 10mm rods on the Y would probably be a good idea. A Bowden extruder system should allow sticking with 8mm rods on X. I dont think i have seen any prusa style printers with 10mm X rods.