This is a charging dock/stand for the Switch Lite since Nintendo cheaped out and didn't include one. :) It uses the included USB-C charger. You can see a video of printing/assembling it here: https://www.instagram.com/p/B7IHfYvnaEV/
You'll need an M3x20mm screw to go in the back to secure the USB-C cable in place, and I recommend Command Strips to hold the dock in place when you're pulling it off the charger. Have fun!