If you print technical documents often, I highly recommend a wire-binding machine like this one:
https://www.renz-germany.de/produkte/renz-ring-wire/eco-s-36...I've got a lower-end model, second-hand, still not cheap, but it's so cool.
You get real wire-o binding (not spiral binding!), so your book lays open flat on the table and the pages are right next to each other, not slightly displaced vertically like with spiral binding.
