Have you noticed that shirt collar stays are all shapes and sizes these days? A simple SCAD model to produce collar stays, chose the length, width, thickness point angle and point radius. I think that covers it all! Oh and you can include a monogram, although you can see in the ones I made that it wasn't perfect.I printed in ABS, at 0.2mm layer height. The originals were 0.6mm although in ABS this is too flexible, probably okay in PLA. The plain STL and the default in the OpenSCAD file has been updated to 0.8mm