Used the library to add a knurled surface for my Logan 6510/6560 spindle thread protector. Worked great!
Used "fast" option in Simplfy3D; I let it choose the parameters
Printed in PLA. Took about 2 hours. This is prototype to check for dimensions on the lathe spindle. I will probably try to print it in Nylon or ABS and use "fine" mode for actual thread protector.