These 2 adapters allow for mounting 17mm ball joint based phone holders that are commonly sold on chinese online markets.
The adapters allow a variation of mounting positions, either vertically or horizontally depending on your needs and vehicle configuration.
Added a shaft down the middle of the ball joint for added stiffness if you drive a screw through it.
Printed in PETG or better yet in ABS with minimal supports.
The author marked this model as their own original creation.