Holds steady and is only one part. Scale it to ~70% for small 1 pound filaments such as Nylon and T-Glase. I love this because there are not many other one piece filament holders that look good and are only one part. The product for the 100% scale may be a little tight as i only made about 2-4 mm of end play. Happy printing, first upload! If it works please like and show that it does!!