Quick Release tripod mount 43mm to a 17mm ball for attaching common car phone mounts to a tripod.
I designed this for astrophotography use but I can see other uses where a stable tripod mount for a phone would be ideal.
This version fits 43mm quick release mounts, should be possible to modify for other QR and ball sizes if requested.
This has been edited a few times to ensure the phone can be placed both horizontally and vertically without the tripod mount being visible in the photos.
To print this I used 0.12mm layer height and 15% gyroid infill, larger layer heights may be ok, I had issues with it but that's probably just my ender being annoying.
Did have a few misprints with the supports being particularly fussy, tree supports seemed to fall over just at the interface and then the ball and arm would fail.
The author marked this model as their own original creation.