This simple hook attaches around one of the support rods of a car headrest to allow backpacks, purses, or other items to be hung from the back of the seat.  This model is for lightweight items only.  A heavier duty version can be found here: [https://www.printables.com/model/1001924-car-headrest-hook-heavy-duty](https://www.printables.com/model/1001924-car-headrest-hook-heavy-duty). 

Print with the opening for the support rod facing up in order to have the best strength.

Make sure to print in a material such as ASA or PETG that works well in the heat and UV exposure of a car.  Model shown printed in Matterhackers Pro Series ASA.

Print settings (using ASA):

Nozzle: 0.4mm

Layer Height: 0.2mm

Infill: 15% (grid)

Walls: 3

No supports necessary, but you may need a brim if you have issues with bed adhesion since it is a fairly thin footprint on the bed.