They're usually on the 1st and 3rd Monday of the month, in Hawthorn (near Swinburne uni). They start at about 6-6:30pm and go till about 10pm.
Next meetup is on the 18th of March (this Monday).
You can find the website for our hackerpsace at: http://www.hackmelbourne.org/
You can find our location details (including PT and parking options) at: http://www.hackmelbourne.org/about-cchs/location/
We also have a page on Meetup.com where you can register your interest at: http://www.meetup.com/Connected-Communi ... Melbourne/
Note: We hold a lot more events than just the 3D Printer night, so they all appear on our meetup page and on our website calendar. The calendar on our website comes out of our Google Calendar, so if it gets updated the website updates automatically. You can also subscribe to the Google Calendar so the events appear in your calendar.
Hope this is enough info.