This is good for beginners using PLA, or for testing out your setup if you're starting to use flexible filament. Prints very quickly. If you're new to flexible filament, need help, and are using a reprap, my settings are included in the files. I use an old version of Slic3r but that shouldn't matter as the files are human readable. And my advice is to print on blue painter's tape as this material can destroy other surfaces.I've uploaded 3 sizes: unstretched bracelet circumference of 7.5", 8.5", and 9.5"