Use the Printer Selector panel to select the 3D printer you want to use for the printing job.
If you are creating a 3D Printing Platform item, the 3D view displays a grey platform to represent the printer's build plate and a box to represent the limits of the build space so you can see how well the parts fit the platform.
To select a printer for a 3D printing Platform item:
in the 3D Printing Platform item. To redisplay the build space, click the icon again.