I didn't want to spend the $30 to buy these online and decided to make them myself. They work just as a normal fender delete would, but line up with the angles of standard GT WTF rails to look nice while still being functional. Things like the Craft & Ride magnetic fender mounts can still be screwed to them and stuff like that.
I personally printed them with 3 walls and 25% infill, we'll see how they hold up after a handful of trail rides.
The author remixed this model.
Angled to match the profile of Standard GT WTF Rails