I needed a minimal phone mount for my motorcycle. I added the Black Box Embedded Wunderlinq to my bike and it has an AMPS mount pattern built into it.
https://blackboxembedded.com/products/wunderlinq-commuter-edition
I got the idea from mocnak's Tripod Holder and recreated it to my specifications.
https://www.thingiverse.com/thing:4396050
This will work with a Galaxy Note20 Ultra with a Spigen case. I've included the Fusion 3D file so you can modify as needed for phones/cases.
There are two versions of the mount:
Also: https://www.thingiverse.com/thing:4806266
The author marked this model as their own original creation. Imported from Thingiverse.