From MatterControl Manual
< SETTINGS | Printer | Print Area | Size and Coordinates(Redirected from Settings/Printer/Print Area/Size and Coordinates/Build Height)
The height of the printer's printable volume, in millimeters. Controls the height of the visual print area displayed in 3D View.
- millimeters (mm)
In this example, the build height is set to 350 mm and is shown as such in the 3D View preview on the right.