Hello Plaid,
As was said, some costs can't be figured out until you know which college the student is attending, but congrats on planning in advance. College authorities generally recommend that students not work during term time. At the moment many college students are unable to get work anyway, so let's assume a worst-case scenario that the student does not work for four years. In general the numbers I give will be conservative.
Many students will buy a core set of textbooks every year to supplement books they borrow from college libraries. These can be expensive. But assume 4-6 books at approx 50-70 euro each per year. Say 350 euro per year?
Many colleges charge for photocopying and printing services. Add in stationery: refill pads, pens, pencils etc. You might not get much change out of 100 euro per year.
Storage devices such as stick drives, memory cards etc. say 50 per year.
The other possible large expense at the start is computing and printing. Many students have their own laptops or netbooks. You can put any number down here, but if purchasing a device maybe set aside 500 euro for a decent netbook and 250 for a printer? In this case assume that these items will last for four years. Assume legally owned software may cost 100 euro per year (such as word processing, spreadsheeting, virus protections, on-line storage etc.)
I'll post some other thoughts later. So far the simple process of buying books, taking notes, saving things onto computers as well as printing, copying etc. may cost 600 euro per year. Technology purchases may mean an upfront requirement of 750 euro.