This bag has to be printed in two parts. The part with lettering has to be placed vertically on print bed and printed on highest resolution.
To Print in Dual colour: The printer dose not have to be duel headed, the print can be paused at the lettering hight and filament can be changed to give it the Selfridges look.
The second part of the file can be printed up right at normal resolution. The file is made, so as to keep the post printing work minimum. So once you remove the small amount of support, the two files can be slidded in easily to form a single bag.