Anyone who has spent a long session clicking away while lying down knows the problem: the arm gets tired of holding one position, and you still keep reaching over to the keyboard for shortcuts. The maker's build attacks exactly that. It is a 3D-printed accessory that slides onto the side rail of a Nintendo Joy-Con and grips an active stylus in two cylindrical rings, so pointing and common commands all live in one hand instead of being split across a desk setup.
The construction looks nicely simple. The printed part carries the stylus through those two rings, and the whole thing was printed in a blue and purple iridescent dual-tone PLA, specifically eSun eSilk-Magic Dual Colour Red/Blue. Visible layer lines show it came off an FDM printer, which to me suits a functional clip like this fine. On the software side, the Joy-Con is paired over Bluetooth and the buttons are mapped with a program like JoytoKey.
How it gets used is the part I find clever. The stylus hovers a few centimetres from the screen, the trigger clicks, and the bumper above it handles right click. There is no tapping on the glass at all, and movement comes more from the arm than the wrist. Several profiles can be swapped depending on the activity, such as one that holds spacebar. The maker reports a great level of control and says it frees the arm and hand in a way a mouse anchored to the desk never does, including holding a laptop in one hand while continuously feeding in mouse and keyboard inputs.
There are honest limits. Only RuneScape has been properly mapped and tested so far, with profiles for Fusion 360 and other desktop apps still on the wishlist. Gyro mouse support is an idea that has not been tried yet, and the maker suspects artists used to a pencil grip would find it cumbersome.