This is a grip/holder for 8th generation basic kindle. This grip can serve as a stand as well. For other kindle models, one might need to scale it to fit. You can find the dimension of your kindle model on Amazon. The size of the 8th gen kindle is 6.3"x 4.5” x 0.36” (160 mm x 115 mm x 9.1 mm) (height x width x thickness).
The knuckle was remixed from https://www.thingiverse.com/thing:2613173. The holder was remixed from https://www.printables.com/model/63495-kindle-grip-10th-gen-v1.
Update May 30, 2022: added a 80% knuckle for small hands. Update the socket holder to make the socket less protruding.

knuckle grip for 8th gen kindle

knuckle grip ball.stl

knuckle grip 0.8 ball.stl

bump_knuckle.stl

This is a remix of https://social.thangs.com/m/64839 by pressprint. I really love the details of that model, but the wings are fixed and you need to use super glue to assemble the model.
I used tinkercad and Microsoft 3D Builder to modify the models, added gears etc to make the wings foldable.
When printed in 50%, it can fit in your palm.
Update 16 May 2022: added two parts, split the top for different print orientation for FDM printers, should be able to improve the quality.

Golden scarab with foldable wings - Moon Knight

top-split-a.stl

top-split-b.stl

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knuckle grip for 8th gen kindle

Golden scarab with foldable wings - Moon Knight