The author remixed this model.
Remixed with the original original tray (https://www.printables.com/model/641521-ender-3-v3-se-cable-holder-binremix) for wider tray body to cover the gap, and make it possible to catch extrusion directly into the tray when hotend is at left most position.
Also reshaped locking tab to allow the tray to slide in under the print bed at an angle. Smaller tab makes it easier to remove the tray too.
In picture: left is widened version, right side is original (printed at speed way too fast for PETG). I'll redo the right tray later. You can simply mirror flip the left tray in slicer.