Kingsong 16X handle repair

Hi.

First, the locking mechanism on one side of the handle of my Kingsong 16X broke (after a little over one year of use). After three years of riding, the other side broke as well. I believe this may be a common issue, so here is my model.

The part is intentionally larger, because there is very little space inside the handle and I wanted as much material as possible for better durability and to allow printing such a small part on my old Ender 3. After printing, minor finishing with sandpaper or a utility knife is required — be careful.

I printed the parts using the cheapest PLA, and one side has been working for about a year and a half already.

The model is designed to be printed in the orientation shown in the slicer image. A raft is required due to the complex shape.

I am also including slightly distorted (sorry) images/models to make locating the screws easier (dimensions are in millimeters). I strongly recommend heating the side pads before attempting removal. I do not know if this is the same on the refreshed version of the wheel.

I drilled out the pin in the lower part of the metal mechanism and replaced it with an M3 screw and two nuts, as shown in the detail photo from inside the wheel. There may be other ways to repair it, but I was not able to find one.