I was wondering if anyone has considered trying to reproduce the Casimir effect using plasmas from metallics in closely articulating discrete balls? Think in terms of a ball within a ball, if you will. Perhaps pressurizing/vacuumizing the plasma chamber to force the materials to mass separate would work. I would imagine the two materials should be rather close on the periodic chart such that the separation would be quite minute, as with the closely articulating plates that produce the over unity Casimir effect. No doubt this is at least in part what stars are doing and why they grow over time. At any rate, if two closely articulating metal plates can produce some overunity just think what two closely articulating plasma sheaths can produce!