This grip works very similarly to the grip you get with the Nintendo, but it's way smaller.
Some people may find it too small, and uncomfortable.
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You can choose whether there is a hole for a leash, and pick a level of three tolerances
Low/Medium/High tolerances, all spaced out by 0.25 millimeters, to fit perfectly with your Joycon, for instance: if it's loose such that the Joycon comes out without you pressing the release button, pick a tighter fit.
And if it's too tight such as it doesn't attach, pick a lower tolerance.
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You may need a smaller nozzle (talking 0.4 or less) to make this.
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Print instructions:
Put the model on it's smallest side. (see the image)
The author marked this model as their own original creation.