Behold ... The Travel Nanny!!!
Since my toddler is now super interested/zombified by the Wiggles, and we have a long drive home some nights. This is a very quick version of a caddy/phone mount for the passenger seat head rest. I used to use a Galaxy S4, then S7 Edge and now it also fits (like a glove) the S9+.
Pictures show dimensions. Internally room for 13mm thick phone and 164mm long for what ever you want to slide in that fits.
If you need adjustments, let me know...
Either way, it just clips onto the two chrome poles on the head rest, slip in the phone and hit play on the Wiggles... enjoy the peaceful ride.
Lazy Parenting FTW!
edit Added new speaker mod version for directional sound at the kids and not our ears :)
Depends on how strong you want it
I made the walls pretty thick to cope with the clip arms... around 2mm thick is good as the clip arms are 5mm thick... I think I printed them solid. But feel free to experiment.
Printed upright for best final finish but needed supports under the arms. Took about 9 hours on my machine and ran it overnight.. next morning it was good to go.