These are pinch style control sticks for the JJRC H36 and Eachine E010 quadcopter controllers. They are designed to simply press fit in replace of the stock control sticks which are too stubby and don't allow for precise control.
Print with 3 shells and use a brim to help with bed adhesion.
I've made a version 4. It's designed to fit the contours of the thumb and index fingers for more comfort and better control. There is a tall and short version depending on your personal preference.
I just got my first 3D printer and have finally been able to print these myself. I printed version 3 with great success and I am very happy with how they work. I haven't bothered with version 2 and have removed it from the downloads.
I have uploaded version 3 which should fix slicing issues that version 2 had. The part is completely solid, 1mm wider, and has no more overlapping segments. The grooves are still pretty small, so a smaller nozzle setting might still be needed.