Part of this spell pisses me off: The ordinary wizard can fabricate "clothes from flax or wool," but to fabricate "items that ordinarily require a high degree of craftsmanship, such as jewelry, weapons, glass, or armor," you need proficiency. Good clothing that fits right takes weeks of work and knowing what you're doing.

My group likes to put a good amount of value on skills & tool proficiencies, and we use this homerule: "The quality of objects made by the spell is commensurate with the quality of the raw materials as well as the caster's understanding of what would ordinarily go into the formation of the object. As such the product something that the caster could craft by hand, given all the time, tools, & resources they need."

So with this, to create basic clothing or fabric from flax or wool, you need to know how to use a spinning wheel & a loom (Weaver's Tools), and it's assumed you can figure out scissors and needles. Common clothing includes chitons, tunics, robes, caps, kilts, cloaks, hoods, & scarves. For finer clothing you'd also need to know patterning, measuring, & finer concepts of garment fitting (homeruled Tailor's Tools).

 Time to make an original observation that no one has ever made probably and isn't obvious definitely! "Fullmetal Alchemist".

I'm just gonna drop this right here, tbh this is from 3rd edition and wall of iron isn't around anymore but there are other things that it can be done with. Wall of Stone

https://1d4chan.org/wiki/15,000,000_Gold_a_Day

How were you allowed to cast within 120 feet of a hostile flying dragon, uninterrupted, for 10 minutes?

Would you be able to fabricate a person's limb back onto their body? Like, you can find the arm and the person still has enough blood to survive.

Like, say you line the arm back up properly and casted Fabricate on the area where the arm and body needed to be reconnected. Would that work?

Unfortunately, (although that is a very cool idea!) it does specify that creatures can not be transmuted by this spell. Plus Regenerate is one of just a few ways of returning/reattaching severed limbs and that's all the way at 7th level spells.

Yo. Idea. Petrified creature gets broken. They're made of stone, right? So just gather up a proper amount of stone and Fabricate. You'll fix the petrified character for the Cleric to Greater Restoration.

RevRawr, that is a brilliant use. Thank you. 

No problem.

Quote from Cattersby >>

If a mundane steel door is encountered, could you fabricate it into 1x1 ft metal chunks that could be easily carried away? Would this work with higher level materials?

 I like this idea, but you'd probably need to make them smaller than that. A cubic foot of iron is about 491 pounds, well over what most characters can lift, let alone carry for long periods of time. A pile of 1-pound ingots sound a lot more manageable. You may also require proficiency with smith's tools for this, as metalworking falls under that tool proficiency.

I dont know but now I want to :P

Quote from Rexir2 >>

Quote from Cattersby >>

If a mundane steel door is encountered, could you fabricate it into 1x1 ft metal chunks that could be easily carried away? Would this work with higher level materials?

 I like this idea, but you'd probably need to make them smaller than that. A cubic foot of iron is about 491 pounds, well over what most characters can lift, let alone carry for long periods of time. A pile of 1-pound ingots sound a lot more manageable. You may also require proficiency with smith's tools for this, as metalworking falls under that tool proficiency.

 It would probably require proficiency in blacksmithing to reduce the metal door down to something manageable, like say trade ingots. If I had to DM the situation I would tell the player to make a proficiency roll for Blacksmithing and with a success, rolling against the DC of the door's material and its construction, resulting in the door being wrenched from its mounting and collapsing into a nice pile of ingots at the player's feet over the spell's duration of ten minutes.  Failure would result in the door being twisted into a single amorphous mess that falls to the floor with a loud clang at the end of the spell.

What artisan tool skill would be needed to create a heavy crossbow?

If the petrified creature is in large enough pieces to be fit back together, you could also use Stone Shape to “stitch” the pieces back together with a medicine check, and then greater restoration for victory.

I’d make the argument for tinkerers tools.

Is it possible to make multiple items at once with this, say, a pile of shortswords, so long as they fit within the 5 foot cube?

this should have an M for material components as you need the raw materials as part of the spell casting.

So I have a question about this, is it exclusive to raw materials?   Like, I couldn’t just see an enemies weapon and use fabricate to turn it into something else? 

Ok, first off thank you for reading. I am trying to understand the utter limits of the 5e Fabricate spell. AGAIN, the 5e version of Fabricate not a previous version.

As it takes 10 minutes (60 Rounds), requires that you have the materials, a concept that your player character can conceive of and if it is comprised of minerals is less, and last if has a complexity more than  a bridge you need the skill proficiency to  create it.  The spell is listed as a Transmutation with the creation "tag" and the forge domain.

PC Wizard 8/ Cleric 1 with INT 19, Keen Mind, Skilled in 4 crafting (Jewelry, smiths, Calligraphy (Books), and Mason (Engineering), Knowledge Domain, proficient Arcane, Religion, History, and Investigation, that takes a full day drafting/designing said item(s), then creates by hand a model to help visualize and engineer artful ascetics and possibly have another smith type look at the concept casts Fabricate. 

The raw materials (plural)  of Adamantine, gold coins, silver coins, leather, gems, exotic wood, bone from a dead creature, and others items that are all in his visual range or closer to create the follow using the spell once for each unique item.

1) Breastplate with gems stylized into the armors face with a raven (gem eyes) and nature relief and model for the character to fit

2) Spear with Adamantine filigreed with the locking/setting space for a monstrous fang

3) A square treasure box with jewelers level workmanship with non-magical symbols on it (pure admantine) 

4) A grand chair made from the dead remains of a creature such as a lion or chimera, with a fallen tree, and some iron and such plus some brass

Again the PC has the above skills to make all these give the normal crafting process, can he or she make these items? 
Does the spell require a roll of any type as the crafting of a bridge does not state that it require one?
And do you need the tools present or is the proficiency (i.e. the knowledge) enough to create, like the bridge? 

And as a side note using sand to create glass, i.e. the bridge but made from sand to create a glass bridge that would be artful ?

Thanks.

Can you use the proton neutron and electrons to make gold or platinum?