As you can see the right side works fine but the more you go to the left the worse it gets. I tried using the calibrating tool in system setting but it just sends me on an endless loop, it doesn't even recognize i'm touching the red dots unless i click to the right of them which of course solves nothing.
Currently i'm thinking of disassembling it and giving it some thorough cleaning but does anyone have any other ideas? I never opened a 3DS apart so i'd like to avoid it if i can.