outputs should be equivalent to the amount of materials it takes to craft

OR

based off of durability

ah i was just impatient when I tried blocks, they take awhile. they're both working on my end.

Also it might just be me, but the smelting progression bar would look better on the left side in my opinion.

As for the smelting tools and armor, yeah that makes sense. Parts would also make sense to add, however those should be the amount it takes to cast logically. I cant tell you how many times I've accidently casted the wrong part or the same part twice lol

I'd double check the block and ingots, I tried doing last night & it didn't work. I'm not home right now or id check again myself

I will look into it. Might be one of those rare bugs that only exist outside the dev environment

all ingots and blocks are smeltable I believe. For tools and armour I am thinking of doing at most 1 ingot to prevent the smeltery being used as an uncrafting method

The first is dev and the second is release. Both seem to be working in the latest version. Perhaps you tried it with a different mod or with the corroded copper blocks (if I did not add them to the tags) ?

If it appears to be at max progress but is not going further, the smeltery's fluids are probably full

Reworking the gui will not be a priority at the moment. Parts are already supported unless something broke with that recently