This is an old game it's possible to get the models to do w/e you're trying to do again but I doubt anyone here knows. Sorry to say but you should have ask this question when bladeandsouldojo was still around.
Try askin peeps in youtube vids that do what you're tryin to do as well.
I also hate to say this but try askin in the bns reddit as well. (ew)
well the model himself as you already know , you can get by umodel , transfer it to 3ds max save in STL format , download any slicer program i suggest you software named slicer you will need it to do the fix process its doing that automaticaly so download slicer , do some adujment how you want to print it i mean the print quality this is the most critical step its realy help me if you say me the printer model i may be then can help you a abit but in this part is critical so you need to know what you doing once you finish that part you ready to print .