This is simple and lightweight alternative head for my old florabest grass trimmer. I hated plastic blade which was keep breaking just too often. So I made this alternative head to use much cheaper string instead and to keep it still lightweight enough for this poor engine.
That's really dummy design but it surprisingly works just fine and finally it started to be practical as far as with blade it wasn't.
The good is that you don't need screw (it fits exactly on place) because I've lost it and I was unable to buy left thread screw in any store. In comparison to powerful gas engine driven grass trimmers it cuts well the grass in the nearest proximity without breaking the string. It's cheaper and more effective in my point of view.
So you just push head on place, put string in it and tight it by the screw cap. It's right thread screw. Pehaps left thread would be better but it doesn't seems unscrew. You know, it's not that powerful. If you wish left thread screw then you can use just mirror tool in your slicer.
It's designed for narrow 1.5mm string.
The string you put in is curved, so put it in rotation that let it go out from the head.
Print upside down.