Thermal Detonator Cannister for 3d Printing, the Pipe while included is not required to be printed. The pipe is an internal 2.5 inches or 2.667in outer (68MM outer and 64mm inner for the rest of the world) pipe.
As per the files, you will need to print two of the end caps.
It should be printed and grey for the tube, the front plate and endcaps should be glossy white when finished likely need some sanding and painting.