Hello I have a Ender 3 Pro and I just install Ender Extension 300 X 300. My Cura V4.11 So I enlarged curas bed to 300 and designed trackwork for sliding workbench doors. I had printed them up smaller before on stock 9" bed. but I had to redesign them. I increased to 10.5" to try new 12 X 12 bed. I was wondering why it looked like print object was looking "cut off" on one end. maybe Ill try one of original files to see. Well what I cam to relise is I still have original 8bit board in my ender. I could find a setting in the Ender to change new bed size. Guess I'll be installing SKR 1.4 pro sooner if I want to take advantage of 12 X12