370mm X 250mm X 300mm

[fredk]

You are not going to get a full 400mm on the x-axis, even with mods. Stock the max build size is 350 x 250 x 250. You can extend the x-axis to about 270 with a custom extruder mount or if you switch to a Titan style extruder and pancake motor.

FYI, your kit should come with that external mosfet if it is a v2 board. The V3 bed supposedly does not need it, but I would put one on anyway. There are not enough V3 heatbed kits out there yet to know for sure if they have resolved their power draw issues.

I didn't get to the point of printing this weekend. With the change in the weather here (snow and damned cold) I just want to hybernate for a month or so until the nice weather arrives. Made yogurt and cleaned the house instead.