This is a remix from andyleer's simple yet clever Nintendo Switch stand on thingiverse. His stand worked without a problem, but sometimes the 45° angle isn't as comfortable, so I increased it to 60°. I highly recommend printing his, too. They're easy to swap out!
These slid into the joycon channels without much fuss straight from the printer, but they do slide in a bit better after a small amount of sanding.
They're also small enough to fit in my Switch case, too!