With a return to the drachma unwanted, could Greece just print its own euros?

Greek central bank has a currency press outside Athens, but actually going ahead and printing unauthorised notes would be an extreme step

Faced with shuttered banks and ATMs all but drained of cash, but with most of its citizens saying they would rather stay in the eurozone than revert to the drachma, could Greece simply decide to print its own euro notes?

It is certainly physically capable of doing so: the Greek central bank owns a press in Holargos, a suburb of Athens, that once printed drachma and is currently one of 14 high-security currency printing works across the eurozone producing euro banknotes.