Ryobi 40V Trimmer shaft cutting sleeve

I discovered when clearing really thick brush using the brush blades on the Ryobi 40V trimmer that the long grass would tend to wrap around the shaft at the flange above the head and would build up enough to stall out the head (see the photo). So I built a sleeve that bolts on with cutting blades to cut the grass. I originally printed this is PC Blend but for added toughness am reprinting it in NylonK (kevlar filled nylon from Matterhackers). I have included the STEP file if you want to modify. This uses M3 bolts and a M3 nylock nut.

This was modeled in OnShape CAD