Customizable Universal Connectors - rectangular

Hello Thingiverse members!

These are my Universal Connectors, part 2.
The first set of Universal Connectors was pretty rounded to connect round sticks and gadgets.
The first set of connectors can be found here: http://www.thingiverse.com/thing:1165439

This time, we have rectangle shapes which can be modified to fit your needs in the Customizer!

A few parameters to use:
1.) Outer width - how thick the connector wall will be (in mm)
2.) Hole width - hole size in mm.
3.) Connect len