Oddly enough while I thought of that the cost was actually a bigger factor. I don't know what the average length or number of pages is for a SCOTUS Cert petition but at 40 copies I would imagine that a professional service could do it MUCH more cost effectively than a home printer. The cost of the ink cartridges alone would be staggering. Even if you did get it printed at home there would still be the cost of paying a printer to bind them correctly too. May as well contract out the entire project.
For the last one I did, the petition was roughly 20 pages (plus tables) and our opposition was 13 pages (plus tables). I was actually surprised how little the printing service we used charged. All I had to do was put together a raw Word document and e-mail it to the printer, who formatted it, prepared the tables, printed and bound all the copies, and filed it. We didn't have to worry about any of the formatting rules or how many copies to submit, etc. Total cost was somewhere in the neighborhood of $500.
Would that attorney be responsible for oral arguments if the petition beat the long odds and was selected for review?
If that attorney is the attorney of record, yes. Of course, counsel can sub out in SCOTUS as in other courts.
Or would one be willing to write for content and format leaving the litigant to print and file?
Only possible answer is maybe.