This is my scaled down fluid bed version. If you don't know what these are used for they are for painting jigs with powder paint, the way it works is it suspends the powder paint in a "cloud" of air and keeps it from packing down which in turn helps to keep from getting a coat that is too thick and bulking up the jig head and causing runs when curing the paint in the oven. I personally use it with mostly white paint since I have problems with it being dense and heavy causing thick coats but some people use it for every color.
This version uses 1 1/2" ABS plastic fittings no need to cut or purchase piping to make. Standard fluid beds use 3" PVC but I find I don't need that much area to work with but you can apply the same methods with larger pipe/pipe fitting as well, this is just my version to fit my personal needs. Another point is it takes less paint and storing and making extra cups is easy and requires no cutting. When storing if you're worried about damaging membrane thread into a cheap female coupling to lift/protect membrane.
Parts list top to bottom:
Slip flat cap
Slip x male adapter (the male side screws into the base)
Membrane brown lunch sack super glued on then sealed with silicone on the inside
Female x slip adapter
Slip flat cap
Craft foam (I used sticky back craft foam), felt or whatever you choose to put on the bottom to reduce noise and level out flat cap raised writing/casting nubs
1/4" to 1/8" fitting with 1/8 NPT threads
Standard aquarium airline tubing
9/32" drill bit if you're planning on using a threaded fitting for airline
1/8 NPT tap to thread hole
Teflon plumbers tape to seal off fitting
Razor blade/Exacto knife
I personally use a dual outlet aquarium pump, Aqua Culture 20-60 gallon dual outlet aquarium air pump to be exact from Walmart. This is more than enough to run 2 cups and having a bleed off valve might be needed depending on air pump you're using and for fine tuning. (See for details) http://www.bluegilltalk.com/viewtopic.php?t=4444
Parts for base cutoff to the right is cup parts
Parts not pressed or screwed together.
"Cup" sitting on top of membrane material (brown lunch sack) without slip flat cap.
Coat bottom rim of "cup" with brush on super glue and press onto membrane material, let it set, trim with Exacto knife around outside base then seal with silicone and let cure.
Base female x slip adapter mated to slip flat cap as far down as it goes. Craft foam attached and trimmed to level and deaden any vibration noise.
Drill hole into base and tap the hole to thread fitting.
Wrap fitting threads with Teflon tape and screw into base.
Screw cup into base. Finished/assembled just add paint and air pump