I found that the grass would coat the charging pads on the bottom of my Mk1 Lymow mower.
This extended strip definitely doesn't stop the grass buildup, just reduces it. I was having to clean it every mow.

Creality

Ender-3 Max

Doesn't Matter

No

0.8mm

65%

I used TPU 95a filament for the flexibility.
Because it is so thin, the infill is not critical but I wouldn't print it too low.
Using a 0.8mm nozzle for the print isn't necessary either. It just made it print faster :)