Nail knot tool for fly fishing line

Nail knot tool I made since I didn't like the other one on thingiverse. Mine is meant to have a deeper groove for the line. It worked for me and my wraps didn't slide off.

I'd recommend printing fairly sturdy, mine is not and it bends quite a bit but still works. This tool is tiny so if you have thicker line you may want to scale up the print a bit (if i had to guess 8 wt and higher would be a little big for the size of the notch).

Hope it does what you need!