Custom fit holder/clamp for a Kindle Oasis 3rd gen with its cover/case.
Has mounting holes for both universal AMPS style mounting balls and RAM mount 3-hole mounts. Should be compatible with most 1" (B-size) balls.
I have it clamped to my bed's headboard, so I can read comfortably at night, with help of a remote page turner.
Note that clamping force is dependent on what springs and screws you use. If its too weak, switching to longer springs and/or shorter screws can improve it. It can generally hold a Kindle in place through most motions and vibrations, but it probably isn't suitable for stunt drivers or offroading.
I printed in Nylon PA6-GF and PTFE, but you can probably print in any material, as it's not terribly dependent on flexibility, and has enough intrinsic strength to hold up what is a relatively lightweight device.
Assembly is required, you will need: