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Why don't banks print their own paper money / bank notes? 
In the US, this was the case during the 19th century. There was a system of "subscriptions" between banks, where larger banks backed the smaller banks to some extent. In trade, notes from distant banks were not accepted or discounted relative to known local banks, or silver/gold coinage. There were a number of problems with this system which came to a head during the Panic of 1907. During this crisis, a cascading series of banking failures was only stopped by the personal intervention of JP Morgan. Even when Morgan intervened, it was very difficult to make capital available in a way that avoided the panic. The subsequent creation of the Federal Reserve was a response to that crisis.