Seam Ripper to replace gingher

My favorite seam ripper was made by Gingher for years until recently. It had a retractable blade using a living spring and used replaceable blades, unfortunately since they stopped making it I was out my favorite tool. I went about modeling and printing my own interpretation of the design with replaceable blades made by Xacto, 3 days later I had a fully reliable and functional prototype!