Hi PastelHarmonics
This should go in Discussion and Request and not in Mods.
What is the problem you have?
Does it show you the nickel at the input of the forge or not?
Do you have a 3 slot enabled in the forge?
Can you upload an image of how your forge is displayed?
Checking your xml code detect this, unit_nickel and resourceNickel should not have the same type of Material, it has to be different.
An example is in unit_iron = Material = Mmetal
resourceForgedIron = Material = MresourceForgedIron
You have to have two types of material for each thing, so I have it in my mod and it works without problems.
<material id = "MresourceGrafenoFragment">
<property name = "damage_category" value = "stone" />
<property name = "surface_category" value = "stone" />
<property name = "forge_category" value = "graphene" />
<property name = "Experience" value = "4" />
</material>
<material id = "Mgrafeno">
<property name = "damage_category" value = "stone" />
<property name = "surface_category" value = "stone" />
<property name = "forge_category" value = "graphene" />
<property name = "Hardness" type = "float" value = "1" />
<property name = "stepsound" value = "stone" />
<property name = "stability_glue" value = "120" />
<property name = "Mass" type = "int" value = "10" />
<property name = "MaxDamage" value = "500" />
<property name = "Experience" value = "2" />
</material>
Hope this helps you.
Regards