This is a replacement part that fits on a Vansky mobile phone holder. It has a 17mm ball end that mates with an iOttie Qi charger, providing a much better mounting option than either iOttie's suction cup or vent clip.

This piece is a drop-on replacement for the original gooseneck's head. Unscrew the original, replace it with this one, and reuse the set screw.

if you have a different mount than the iOttie that you'd rather use, and it has a ball socket on the back, you can simply adjust the diameter of the ball in the OpenSCAD source to custom fit your own preferred phone mount.

Vansky Gooseneck Charger on Amazon
iOttie Easy One-touch Qi Charger on Target.com

Prusa

I3 MK3S

No

Yes

.20 mm layer height

40%

I have a phone holder that plugs firmly into my lighter socket, with a gooseneck that's a perfect fit in my car. I really like the gooseneck, but the original holster isn't exactly convenient and didn't fit my new phone. I really liked my wife's Qi charger, but it's only available with a terrible vent-clip mount (that falls off constantly) or a terrible suction cup mount (that blocks vision). I wanted to join the two to enjoy the perfect mount, but the gooseneck's ball is 13mm while the iOttie's ball socket is 17mm, so it wasn't a simple "swap one mount for the other".

My first attempt was to print a hollow sphere to wrap around the existing 13mm ball, but that part deformed under the heat and pressure of a car's interior, and it wasn't durable. After looking closer at the gooseneck, I discovered the ball end was a simple plastic part held to the end of the flexible steel by a set screw. A few simple shapes in OpenSCAD and I had a fully functional replacement part.

Here's the AdapterSphere I designed first.