A remix from: https://www.printables.com/model/339122-camping-accroche

To be fair, Arthur's model works perfectly well. I printed it at 1500% based on some comments and it held the cords strong. I just wasn't a fan of the long teeth which I felt could break under tension. I compared it to the original store-bought kind and noticed much smaller and solid teeth so I made edits using his design as a starting point. 

You can compare the original (metal) with Arthur's model (larger on the bottom) and my remix (orange on the right.)

Works great, holds fast.  I printed at 100% infill and I have not been able to break one under tension yet. I'd love for some of you to take these for a spin and see how well they work for you.