Stihl hardhat earmuff base plate

thingiverse

These Stihl earmuff bases are known for breaking (granted, it took a pretty good tug on mine, completely my fault). I did a few iterations of this as ABS is the strongest material I keep on hand and I needed to beef up the weak points (doesn't affect usability, just weight I suppose). The original is the first picture showing the weak points in the part (in red). The last picture is the part I created. I showed the supports (in yellow) in one of the pictures. You'll need to trim the tiny corners of the cover, also shown in red. I noticed they flex less than the one original I didn't break, so I hope they last.