Summary

As I use Samsung S4 mini as navigation system, I built this holder based on other phone models holders and vent fixings.

Instructions

Print S4 mini crad and 2 vent mounts (one mount and the same with R)
Attach Vent mounts to Crad using contact glue or with screws.
I use this holder for more than one year and it doesn't damage vents or leaves marks on the dashboard. Phone never went off crad.
I prefer to attach vent mounts to crad using screws because it makes it easier to unmount holder from vents, especially if space between vents is small.
I used fill in rate of 60% for vent mounts
For crad, I print with raft as printing is a quite long process.

I prefer vent mounts "car_vent_mountLargeI" and "car_vent_mountLargeIR" because it brings more angle view to driver.

Please note this was made for left hand drive vehicles,so mirror it if you have right hand drive car.

S4 mini holder for car vents - Volkswagen CC ou Golf