I like the cooling block, with the holes drilled right through the length, but it's hard to do.
The problem with stacking pelts is that there is energy dissipated by the first pelt, beyond what is used for transfering the heat. The second pelt also adds its own heat, which together makes it very difficult to cool.
It's not impossible to do, it's just not efficient. You could stack ten pelts if you really, really wanted to, but what's the point?
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