Unlimited supply of national currency?
When a country, or perhaps a country's central bank, prints money it is increasing the money supply. When the amount of money available in an economy increases, the value of the currency will decrease. So think about the capital flight from the Euro to the Kroner that is causing the value of that currency to spike. Printing money can basically cause a 'reversal' of sorts. That is, it places downward pressure on the value of the currency. 

So Denmark's banking authority might have some large stash of Kroner to meet the current demand. It can sell Kroner to counter-balance the new fluctuation in demand to keep its currency's value from spiking. Denmark might make this decision to avoid making its exports more expensive etc. However, it certainly does not have an unlimited supply of money. If it was willing to print an unending amount of money, Denmark's banking authority would actually  be manufacturing hyperinflation. 

I've written this in a non-techinical fashion. Please let me know if you want more details.