This is a large (about 334mm high, scale as needed) scream tank inspired by Monsters Inc. Assembly is pretty straightforward: bottom, middle, ring, body, ring, middle, top, valve. You'll need to print two each of ring and middle. Except for the main body (which has a hole for the meter) and top, it's been designed to be printed without supports.
The meter box on the side is three pieces and slots into the body and the meter (which I printed clear, but it's up to you, of course) goes inside the box before the cover is glued on. Then it's up to you to paint the details and add lettering.
There are some other scream tanks/canisters on Thingiverse, so please do have a look as some have advantages over my design. But if you're looking for a simple build, this may be the one.