My partner recently has gotten a new (to her) car. Though it has a touchscreen radio/navigation system, it hasn't been updated in almost a decade, so we needed a different navigation system altogether. In addition, we also wished to have a dashcam.
With those parameters in mind, I decided that designing a phone mount for the vehicle was the way to go. (Most people just use google maps on their phone anyway.)
I designed a simple two segment articulating arm that pivots on a windshield mount; in which is securely held in place via three 43mm diameter suction cups. Arm links and pivots are held together with three knurled nuts. The Phone Latching Plate (The bit that actually holds said phone) holds phones in "landscape" orientation, via inbuilt 1.5mm thick tension springs. (See Notes 1 & 2)
The spring reliefs and cutouts on the rear of the Phone Latching Plate allow for heat ventilation from the rear of the mobile device, in case of heavy power usage or charging. The rear cutouts also allow for camera usage, in case you wish to not buy a separate dashcam. (See Note 3)
After testing this for a few days, I can say my partner and I are quite happy with it's function.
Future updates may include the following:
* Thicker arm links.
* Indexing points on the arm links, for ease of positioning.
* Pivot that allows horizontal rotation of the Phone Latch Plate.
* Larger diameter knurled nuts, for ease of a friction position hold for arm links.
Note 1) PLA is a poor material for springs of any kind, although strong, it's quite rigid and brittle. Use caution when using phones wider (with or without an external case) than 77mm. I designed this to hold my Moto g6, and have tested older phones.
Note 2) Keeping PLA prints in a hot car can cause terrible softening and warping. It is HIGHLY recommended to print this in PETG. Use PLA only if the vehicles AC is on, or the ambient temp inside doesn't reach more than 50C (122F)
Note 3) Many Motorola phones have a camera in the top center of the device. The cutouts on the Phone Latching Plate might not allow camera use for phones using a top corner camera placement.
Suction Cups: https://www.walmart.com/ip/Ook-1-lb-Medium-Suction-Cups-6pk/46494680