Thank you very much LambdaFF - much appreciated.
Agreed - 3D printers don't seem to be quite capable of mass production yet.
I guess I am not quite ready to give up on the idea though...
I would not be adverse to reducing the output volume and simply increase the number of printers (depends on the cost of each printer).
Are you aware of any relatively robust 3D printers for under $5000 US?

Appreciate your advice, R