I made this as an alternative solution to front-mounted streak filters. It's a 3d printed part with fishing line that sits inside of an E-mount to EF adapter.
Flares are not super consistent. Sometimes they appear or disappear out of nowhere. This is shown in the Anamorfake It guide, but this has a much simpler use than front streak filters.
Bokeh will get lines. You can rotate the alignment of the streaks to your liking. The lines are neutral, meaning you'll get flares with the same color as the light source. You can tint them to your preference using a permanent marker.