I have a VegePod and the feet have started to sink into the ground.
These feet help to stop this as they give the legs a bigger footprint.

Here's the source if you want to tweak it.

https://cad.onshape.com/documents/169db52c6b3ca799fd18cf41/w/45c1b21be85b4bce724378be/e/7bbfbcb57ec0f13ddf040d0e?renderMode=0&uiState=6609513c2ee534730897bd11

It can be used for other legs. This one works with 40mm square section.

Doesn't Matter

No

I used 40%