Summary

This Nexus S holder plugs into the Audi MMI Radio by replacing the SD-Card Cover.

Instructions

Just remove the original SD-Card cover from your MMI Radio and plug in the custom cover with integrated Nexus S holder. The design can easily be adapted to other smartphones. (Openscad file is attached)

I had to add some support pillars because Slic3r did not create the support structures automatically :-(
If your slices (e.g. skeinforge) is generating support structures , you can comment out the pillar creation.

This work is still in progress.

Nexus S holder for Audi MMI Radio