VW Amarok Multi-attachment adapter for air vent phone holder

Simple little adapter that fits into the multi-attachment point in the Amarok 2010-2016 dashboard.

Allows the use of the [Kenu Airframe+ phone holder](http://amzn.eu/fguZUzQ). Probably works with other similar holders.

Print it with supports for the overhang.

The version pictured had lugs that were slightly too tall to fit in the slots in the attachment point so I filed them down a little and it went in snugly using a small pair of pliers to twist it. Accordingly I reduced their size s