To my surprise, I wasn't able to find any good stands for the Joycon Grip, so I made this one. Feel free to edit and improve as you wish.

For best results, print the stand laying on its side. Tree Supports on Cura work great to support the overhanging section at the top without damaging the surface beneath.

I printed the logo insert using a 0.2mm nozzle to get a better surface finnish.

I recommend using 3 perimeters and ~20% of any 3D infill to make the part more rigid.