Given my impatient personality, I didn't want to wait for magnets and tension pins to arrive in the mail to put together this AWESOME Halo 4 Helmet made by big_red_frog. I also don't like the messiness of gluing. So, I created these connector pieces you can print out instead.
Each one takes 3-5 minutes to print. I tried printing 20 at a time, but due to minor imperfections when printing multiple small pieces on one build plate, the cylinders won't be strong unless you print one at a time.
So, I recommend you don't print multiple pieces at once. Instead, print one piece at a time. This requires that you sit right next to your printer and repeatedly press "print" every 3 minutes, so pick your favorite TV show and get crackin'!
I printed using Makerware's Standard resolution settings. Original Halo Helmet can be found here: http://www.thingiverse.com/thing:158120