Warning: this part is not intended to use and you may loose your warranty, or cause damage to yourself, grass, or property.
However, I'm using it with great results.
Use on your own risk and responsibility.
Print with at least 80-100% infill, wall thickness 1 to 5mm.
Best results with a (semi)flexible filament.
PLA: biodegradable (yes!), too brittle for most serious tasks (no!)
PETG, ABS: non biode(no!), works pretty good (yes!) not as good as flex?