I often seen printers like this in offices and schools. Considering how we can have printers small enough to fit on a desk, why are these printers taking up half a room? What are they capable of doing, and why do they need to be that large?
One requirement is serviceability and time between refills (of either ink or paper.
When printing 15 copies of a 100 page report you don't want to have to stand next to it and refill the paper and ink 10 times before it's done. Instead you want to push the button and then pick up the stack for binding later after you had your coffee.
Having components be serviceable means that you need to be able to access them or remove them. This means adding space for an arm to reach in (and possibly a head) or adding bulk for the interface of the module and the rest of the machine (or both).
These environment requires a printer which are supposed to include photocopying, fax, scan and a risograph among other functions. Risograph are highly needed in offices and schools for high-speed duplication of printed materials such as questionnaires, examination papers, forms, etc. The risograph can replicate a copy into 500 pages in about 2 minutes so this saves a lot of time and effort.
See its specifications below: