Print the top from here and the bottom part from the original model.
The author remixed this model.
The original case is made for the original Pico. While the lower part stills fits, the top does not, since the Pico W has a reset button and a debug port. So I've modified the upper part of the case to add holes for those, and some ventilation. The hole for the reset button is much too big, because otherwise I couldn't press it with my big finger. So feel free to make the hole smaller, I've included the Fusion360 file for easier editing.
As you can see in the photo, the Pico W fits tightly.