You can use this 3D model to print Aim sticks, compatible for Aim controllers.

You can print them in 3 different sizes:

-Low

-Medium

-High

Edit: i just uploaded the stl's to print them as a unique piece.

I used two different materials, TPU for the top part, and PLA+ for the stick. You'll then need to assemble those two parts (a flathead screwdriver might help).