This is a stand for the ZEERA MegFold 3-in-1 wireless MagSafe charging mat.

https://zeerawireless.com/products/zeera-3-in-1-foldable-travel-magsafe-wireless-charger?variant=43602164842736

While the charging mat can magnetically fold itself into a triangular stand, it cannot hold a phone in a portrait orientation. I used Fusion360 to fix it.

This should also fit any of the hundreds of generic charging mats of this kind, that you can buy online. If the dimensions don't quite fit your charger, let me know and I will modify a version for you.

Prints very easily with a few supports and no special settings.