This is a spacer meant to be used to repair joy con drift using the method shown in this video:

https://www.youtube.com/watch?v=Vid8lIXmZwE

Instead of cutting cardboard and that imprecision, you can just print this spacer instead for that extra pro touch. I used double sided tape to hold the spacer in place as I reassemble the joycon. This is a VERY fast print, about 3 minutes. While this may not repair all joycon drift issues, it has certainly repaired mine, there is a test demonstrated in the video to see if this is the method that will work for you.