Leather Edge Burnisher

thingiverse

You can buy an overpriced wooden burnisher – or you can print your own. I have tried both, and I just can't tell the difference. Just keep applying water lightly to the edge of the leather and rub the edge with this tool until it reaches the desired look. The tool was made to fit on a drill, but I find that there is no need for that as hand rubbing is more predictable and effective.