I imported the original STL into Fusion 360, took some measurements, adjusted the sizes for the case of the TW4, which is a bit smaller than previous models. I also made the hole for the USB plug a bit smaller to get a press-fit. I had to push the plug in from the bottom with needle-nose pliers. It is a tight fit on my print but it stays in place without glue. I also added some protrusions on the cable channel on the bottom to hold the cable in there and I rounded the top face.
UPDATE:
After experimenting a bit, I added a lightpipe for the status LED of the case. Put a piece of clear PETG filament into the hole running from next to the plug to the front. Cut both ends flush and the status LED will be visible on the front.
I have added an export from Fusion360 in f3d and step format.
The author remixed this model.