There is one thing I really don't get.
If we're talking about durability only, not risks of having the private key exposed while printing or risking writing the wrong letter when you do it yourself, why not do both? I mean, it's paper, its costs are ridiculously low, it doesn't weigh a ton, and two pieces of paper 2x10 cm are just as easy to hide as one unless you want to print each letter on an A1 sheet.
So why not do both, put them side by side, and hope at least one will last a century?
In my experience:
- Paper, ink and toner will probably last for centuries. Just keep them dry! And keeping another backup in another place doesn't hurt of course.
Depends a lot on both the printer and the quality of the paper.
While I was graduating university there was an influx of shitty paper that looked great as it was white and almost shined in the light, even cheating papers with small characters printed with the cheapest inkjet were quite easy to read when hiding in your sleeve (not that I did ever that), but none, absolutely none of all my work during those years, although kept in a bookshelf, has more than let's say 60% of the original print, some of the pages have even miraculously glued themselves to each other.
If you use good stuff yeah, it will last a lot, hopefully, but I would still trust a stainless steel plate over the paper, a pen might be mightier than a sword but a steel plate beats the crap out of any sheet of paper.[/list]