Hey guys,
Let's make a list of crafting combinations

4 items of the same slot = slot token of that slot
4 items of the same class = class token of that class

slot token + class token != weapon of that class and slot.

One of each unlock (Backburner + Flare Gun + Ax) = Smelt Blueprint
Three of the same Melee weapon = Smelt Melee Blueprint
Three of the same Secondary = Smelt Secondary Blueprint

Those are the only ones I know.

My friend told me another one that was like, a slot token, a class token, and something else = a weapon, but I don't remember the whole recipe. OH WELL.

EDIT: fuuuuuck jager.

whats a smelt blueprint?

http://tf2wiki.net/wiki/Crafting

Metal Creation

Blueprint	Requires	Produces	Items used so far
Smelt Primary Weapons	3 Identical primary weapons	1 Scrap Metal	3
Smelt Secondary Weapons	3 Identical secondary Weapons	1 Scrap Metal	3
Smelt Melee Weapons	3 Identical melee Weapons	1 Scrap Metal	3
Smelt Class Weapons	1 Primary Weapon + 1 Secondary Weapon + 1 Melee Weapon	1 Scrap Metal	3

Metal Upgrades

Blueprint	Requires	Produces	Items used so far
Combine Scrap Metal	3 Scrap Metal	1 Reclaimed Metal	9
Combine Reclaimed Metal	3 Reclaimed Metal	1 Refined Metal	27

Tokens

Blueprint	Requires	Produces	Items used so far
Fabricate Class Token	4 Weapons from one class	1 Class Token	4
Fabricate Slot Token	4 Weapons from one slot	1 Slot Token	4

Headgears

Blueprint	Requires	Produces	Items used so far
Fabricate Headgear	3 Refined Metal	1 Headgear	81
Fabricate Class Headgear	4 Refined Metal + 1 Class Token	1 Class Headgear	112
Rebuild Headgear	2 Hats	1 Random Hat	2

Weapons

Blueprint	Requires	Produces	Items used so far
Fabricate Class Weapons	1 Scrap Metal + 1 Slot Token + 1 Class Token	1 Class Specific Weapon	11

Notes

• The requirement for a random hat is 3 refined metal, which is equivalent to 81 smelted items.
• A Class Headgear will require 108 smelted items for the metal and 4 items for the class token, for a total of 112.
• The Camera Beard, Bill's Hat, the Ghastly Gibus, and Halos don't count towards the Rebuild Headgear recipe.
• Creating scrap metal requires three primary, secondary, or melee weapons. Since invisibility watches don't fall into any of these three categories, they cannot be crafted to form scrap metal. However, invisibility watches can be crafted to form a Spy class token, or a PDA2 slot token.
• The "Smelt Class Weapons" recipe requires a melee weapon, a secondary weapon, and a primary weapon. As such, it is impossible to use this recipe to combine spy weapons or sniper weapons (because neither sniper nor spy have a melee weapon that they can use to smelt)

The "cannot use spy watches to make scrap metal" is BS.

I have three perfectly useless DRs lying around and I can't to shit with them.

But hey, I already have 1 reclaimed metal and a medic and heavy class token! I'm almost a percent of the way to a hat!

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Agreed. I have 10 dead ringers ._.

What exactly do slot and class tokens do?

You can use them in crafting.
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Lets face it, with achievements, all anyone is gonna use crafting for is hats. 81 items needed for hats? Well I guess they'll still be quite rare...