My enlarger only handles up to 6x9cm, so Polaroid 665 negs are too large to handle. But now with flatbed scanners that can scan negs, there's a possibility of getting prints through the digital route!
Long ago, Kodak made Tri-X (and I'm sure other emulsions) in 16-exposure 3 1/4 x 4 1/4 film packs. There was a paper tab that you pull, just like Polaroid films, except the tab's function was to pull the exposed sheet around to the back of the pack and make the next sheet ready to shoot.
Well, I shot a Tri-X film pack in a borrowed Polaroid 180, back when I worked in a camera shop. The Kodak pack was a bit smaller than a Polaroid pack dimensionally, so I stuck it INSIDE a used/empty Polaroid pack to keep it properly located in the camera. Worked fine, except that it still slipped around in there. My boss and I devved the film in a regular cut-film tank with stainless frames for the individual sheets. So I have some big Tri-X negs of snowy South Dakota Badlands in my files that have never been printed. Yet!
I think if I shot Polaroid now, I'd want something more than the small contact print that comes out; I'd want a neg to play with too!