After using the stock grips for my Joy-Cons I felt I wanted something sleeker with no wrist straps so I made this super thin Joy-Con grip which allows for easier access to the SL and SR buttons. This grip is also good for those who may have misplaced their stock grips, and seeing as how thin this grip is, the printing time is incredibly fast. There is also no need to have holes for the player number LEDs on the Joy-Con rail, as this print is so thin that the light easily goes through.
Printing at 0.15mm may lead to slightly better results. 100% infill is used due to this print's thinness. No supports are necessary. After printing just bend the two top flaps back so the button pressing nubs are clear of the Joy-Con rails for the first time you slide it on. After one use you shouldn't have to bend them again.