WARNING - to get a good friction fit I designed the hole a bit too small so for best results sand down the inner diameter until it fits.
This is designed for flysky and turnigy i6 controllers and holds the sicks in place as well as protecting them from getting hit and damaged. I wanted to design a stick protector that didn't take up the lanyard loop so instead it uses a friction fit. This means you might have to sand the inside, I found that pencils have the right diameter so if you glue sandpaper to a pencil and use that it should work well. I also wanted it to look cool and show of 3d printing so it is quite hard to print. I recommend going at a slow print speed and this model is prone to stringing so also try to get your retraction settings dialed in and consider using a heat gun to get rid of the strings when finished. Lastly, you shouldn't print this with supports because they would be impossible to remove. I instead recommend printing at a lower temperature than normal to make bridging easier.