I have always been under the impression that fabricate was only ever able to make one item, out of one or more different materials.
Although the spell says:
You convert raw materials into products of the same material.
I read this as a general description of how the spell works, so you know you could make multiple different products from different castings.
Further, all the examples given are single items, even when clothes, which I assumed would only count as plurale tantum, as they come in a set, and not multiple sets?
The rest of the spell description implies (to me at least) only a single object is created:
You can fabricate a Large or smaller object.
How many objects can you create out of this spell?
Inspired by this question, which suggests it would be possible to make multiple burgers and/or sausages from a single horse, and not just a 5ft³ block of mince meat.