This little extension is very handy to join all the little Openbeam off cuts. It has internal grooves that align the two Openbeam extrusions for a perfect link.
The design is can be downloaded from Thingiverse.com and printed.
We also have a range of other items on Thingiverse.com that might interest you. http://www.thingiverse.com/protoneerconz
Related Posts
Openbeam used for building a Large Format Camera
OpenBeam – MendelMax / Rostock Challenge
Delta 3D Printer with Auto-Bed Alignment – Kossel Pro now on Kickstarter.com
Metrix Create Space – Take a virtual tourOpenBeam Kossel Pro
Kossel 3D Printer (Rostock 3D Printer) using Openbeam Extrusions 
CNC Mill consisting out of less than 20 parts
Awesome photo!
I reblogged this on my post. Go and have a look. http://scrapydo.wordpress.com/2012/10/22/interesting-gadgets/