I have been asked a few times about makerspaces / hackerspaces in Ottawa, so here is a list of the ones I know of.
Located at the University of Ottawa, this makerspace has 3D Printers, a Laser Cutter, soldering irons, and many other tools. It is open to the public on Sundays from 11am-5pm. Just show up and use them if they are not in use.
Imagine Space at the Nepean CenterPoint Library
This one has 3D Printers and a few laser cutters that can be booked via the Ottawa Library website. You need to book the equipment in order to use it.
Has regular meetups on Wednesday nights. See their website for more details.
In a transition phase right now, trying to find locations to meet.