Wire Cube Connector
thingiverse
I needed additional wire cube connectors and found similar ones at Organizeit's website: http://www.organizeit.com/wire-cube-plastic-connectors.asp?cmpid=gpa&gclid=CKP_gMfQt7cCFeZxQgodUWwA9g. I also looked at wire crates on Bed Bath & Beyond's site: http://www.bedbathandbeyond.com/product.asp?sku=16719773, but this design only has a 4-way connection (compared to an 8-way option), and it doesn't allow connecting at the top or bottom (which I didn't require). Regarding my 3D printing experience with Slic3r, I had issues with the transition from gripper teeth to cylinder, resulting in acceptable but less than ideal boundary surfaces. For better results, try using 3 top layers.
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