This file would be used to 3d print a plug that would be used to make a mold for creating a large tray. The size of the tray is roughly 358mm x 281mm x 31.75mm deep. 

You will get several files. One is the master plug file as a full unit. The other is it all split up with connecting pins added (This was cut up to be printed on a printer with a print volume of 256mmx256mmx256mm).

I have personally 3d printed this plug and created a mold along with a Carbonfiber tray so I know it works 100% as described.