HackerBox #0089 came with a fun Wardriving project built on a main circuit board with external antennas and a display board.
As part of the project, they provided a 2.4 GHz PCB Yagi antenna, as a bare circuit board.
While we can definitely use the Yagi antenna as-is, it is not suitable for tossing in a bag of gear, and the raw circuit board edges are unpleasant to handle. Commercial Yagi antennas typically have a plastic casing, which I have replicated here.
See Part 1 for the project case itself: HackerBox #0089 - Case for "WiSPY" wardriving kit
This should print nicely in whatever PLA you like. Print two of them, as they form identical halves of the whole casing.
You may need to whittle away at the square opening where the jack is attached to the board in order to get things to close nicely.
Once you are satisfied, glue it all together with hot glue or cyanoacrylate.
The author marked this model as their own original creation.