This is a two-piece Sonos Roam wall mount, allowing you to install the mount, then slide the holder into place. The other models I saw did not have a way to keep the Roam's powered on, so this design supports a 90° USB-C cable so you can keep your Roam powered on while connected. You can use the Prusa slicer's mirror option to print for the Left side of the wall.
The author marked this model as their own original creation.