Fishing Hair Sizing Tool for Hair Rigs

I spend a lot of time fishing and making rigs and have always tried to keep my rigs fairly constant. I saw something like this once and thought it an easy enough project for me to start with to see how this 3d printing lark goes.

This tool is used for tying uniform length hair rig knots giving various lengths from 40-10mm hair stops.

This is my first model and print so I thought would put this out there for tips and tricks to make a better design.