Prints in two pieces. The Hook remover frame and the sliding hook grabber.  Need to remove the tiny piece in the slot at the end of the probe.  Easily removed with a knife or nippers.  Once both pieces are printed slide the hook probe into the barrel at an angle until the finger ring is inside the frame.   

To use:
Extend hook remover all the way forward. 
While holding the fishing line (not the fish) insert fishing line into the loop. 
Slide hook remover down line until fishing hook shank is inside the removers loop as far down as you can go.
Pull trigger to securely capture the hook. 
Hook should turn backwards and be easily removed from the fish.