It costs money. And I am broke too. I actually think it would be cheaper to fly from Düsseldorf(or whatever you live) to Copenhagen to take the train to Odense(take an hour and 20 minutes) and maybe faster too. I have two exams, so I don't get free, if I am unlucky late in August. But Again it is chaper to buy train tickets from Germany to Denmark ad with return, than it is buy tickets from Denmark to Germany and back.