There are 2 versions:

1: The pocket clip that is already bent (Strong)

2: A flat pocket clip and a forming tool in 2 parts (Very strong)

I recommend printing the parts out with 100% infill and that the pocket clip be in carbon fiber PLA or similarly strong materials for maximum durability

How to use the forming tool:

1: Print out the flat version of the pocket clip

2: Use the printer heat bed to heat it until it is soft but not melting

3: Align the hot pocket clip in the larger of the two forming tools

4: Place the other piece of the forming tool on top and press it down

5: Hold it together for a couple of minutes until the pocket clip has cooled down completely

Get similar models like it for free here:
https://www.printables.com/@ICant3DPrint