I just found a ton of my old MFB stuff and it occured to me that while dented or even chipped, not a single one of my metal wheels ever broke with regular use.

Has this ever happened?

None of mine have ever broke, however many have chipped

I just found a ton of my old MFB stuff and it occured to me that while dented or even chipped, not a single one of my metal wheels ever broke with regular use.

Has this ever happened?

I have heard about the Poison Wheel breaking because of its poor construction and maybe also the Earth Wheel, but otherwise it's not too common for a chunk of metal to outright break.