Thanks for the info. It helps to have the details.
" The fins are aluminium and are wayyyyy to thin, i've heard reports that have had the fins melt even when boiling water."
Well, guess it's time to add some water and 10,000 BTUs.
If this bad boy is going to fail, it's going to happen here at home."
If the fins are well attached to the cup then they should transfer the heat, problem is the welds on the fins is not good at all.
So you have 2 possible failure scenario's
1/ The cup gets banged about like normal with a backpacking stove the fins become detached.
This is unlikely but still over time the welds will get weaker so i'm of the opinion that these cups are not going to last 3 years worth of backpacking use.
2/ On high heat or the heat being increased by say a side wind the welds WILL melt if the contents of the cup is hot.
With aluminium this is not so much as a worry as the heat spreads around the cup more efficiently.
With Ti though and thin walled Ti especially the heat does not transfer through the cup well, you can have a scorching hot bottom of the cup but the side be ambient cold.
This focused heat, together with aluminium fins a alloy with very low melting temps as is, it's not difficult to have enough heat at the top of the fins that it weakens the weld (might even be glue on my newer version), once this weld/glue breaks the fins have lost a majority of their heat sink ability, they'll then just melt.
My theory is this is exactly what happened on my cup,
I suspect the fins were not attached well at the start and by heating my beans up it melted the rest of the weld, the heat sink then dropped away from the cup and melted in a ball of mess.
I have a few other "heat exchanger" type pots, ETA power, Crux etc and i have absolutely no worry about melting the heat exchangers on these, i've also boiled beans and even made scrambled eggs in them without any problems.
The SolTi cup is a fundamentally flawed design, there have been many many of the exact same failures from many users.
Yet instead of taking responsibility and doing something about it JB are blaming the users instead.
We are not talking about a fragile watch or piece of machinery here, we are talking about a cup designed for backpacking, it SHOULD by design be bombproof.
I understand that some fanboys roll their eyes and say "it's jet BOIL" so any other use is outside it's design remit, i'm of the opinion though that a tin of watered down sloppy baked beans needs to be boiled to cook.
For a backpacking stove to continuously fail by cooking something that has slightly more consistency than water is unacceptable.
It's like a backpack that is rated at 30kg but fails at 31kg, or a tent that is rated for dry use that fails when you wipe it down with a damp rag.
I'd suggest to JB that they carry out a "beans test" on future products, if a stove/cup can't boil beans without failing then it's not much use as a backpacking stove IMO