This was an experiment. My other JoyCon grips print flat on the bed in one piece, which is great for simplicity, but it means that the back of the grip is flat and can't be rounded unless using a fillet against the bed which is a no-no in my book. My compromise was to print the main body and triggers separately. The main body is printed at an angle so as to not need any supports while allowing the handles to be rounded which is far more comfortable in my opinion. The triggers are attached to the main body using one M3x14 SHCS. Be careful not to overtighten the screw as it is screwed into plastic and the triggers can become loose if the plastic is stripped.

UPDATE Oct-29-2024

1. I received some feedback that the universal body could allow the inserted JoyCon to rock if too much pressure was applied to the JoyCon on one side. I have uploaded additional bodies that are specific to the left and right JoyCons, respectively, that do not allow the JoyCon to rock.
2. There was another comment stating that the SL/SR buttons were not able to be pressed using the stock triggers. Although the stock triggers worked fine in all of my testing, I have uploaded an experimental triggers that are slightly longer. Please do not use these experimental triggers if the stock triggers work for you. In my testing, these experimental triggers keep the SL/SR buttons pressed at all times when used with normally functioning JoyCons.