The Belkin Wireless Charger 10W is great for my Pixel 3, however I find I can accidentally place the phone off-center, and then it charges slowly and gets hot, or doesn't charge at all.
Hence I printed a part to fit the phone. The charging coil in the Pixel 3 is slightly off center, so there is an arrow added to the holder to indicate optimal direction for top of the phone. It does work in both orientations.
The design in FreeCAD is attached as well, for easier changes.
I printed with supports touching bed, in the normal orientation (IE top of the holder is up on bed). Once printed and cleaned up, I added double sided tape to stick it to the charger, and done :)
I suggest disabling "Don't support bridges" and reducing the density of the supports to help with removal.
The author hasn't provided the model origin yet.