You will find a copy machine on the ground floor in the "Earth Sciences Library" (house "O", Entrance house "G")
To print, copy or scan you need a "MensaCard".
(The card can be purchased directly in the student cafeteria which is called "Mensa" at German universities)
With your FUBiS student identity card you will have access to all Freie Universität Berlin libraries and can use the books shelved there in the reading rooms. Unfortunately, you may not take books out of the libraries because they require you to have a permanent address in Germany.