Micro USB carkit holder

thingiverse

For a cost-effective solution, purchase a non-universal phone charger and print out a micro USB holder. Apply glue to secure the holder in place, allowing you to easily click your phone into the car kit for charging. This method works well for Galaxy S2 and S3 models, as the USB slot is centered on both phones; other devices shouldn't pose any issues. Enjoy hands-free charging!