I was able to get one of these Polaroid 8x10 Polaprinter Model 3580 but it did not include instructions. I searched all over the web but I could not find any. I saw that a person on ebay was selling the same model with instructions and reached out to them and see if they would sell me a copy. They were nice enough to scan it in and send it to me for free, so I am passing it on.
Download here: Polaroid 8x10 Polaprinter Model 3580 Instructions