Weed Wacker Bump Knob

My Bump Knob kind of disintegrated on me today. Go to the lawnmower parts store? Not today. A little measuring; a little OpenScad; A couple of test prints, Wola. Problem solved, at least from a proof of concept standpoint. I am not sure how it will hold up.

It's been a month or two. It seems to be holding up pretty well.