Rudiger Fire Rolls have been documented being made in situ with primitive or no tools by several people on many occasions in many environments. Much like bow drill, hand drill, flint and pyrite, etc. The old "go into the woods with nothing" scenario. So far I have been successful with cotton balls and the fibers from the stems of milkweed. Bit of a knack to boarding it and to the amount of pressure needed. Too much and it falls apart, too little and it takes too long to get an ember. Much like learning bow and hand drill.
Here is David West rolling Rudiger Fire Rolls on a variety of surfaces. Vertically on a tree trunk, on a stump, using two split branches, etc.
David West: "Ten Ways to roll Fire Rolls"
http://youtu.be/zAifYhNCRV4
A couple of classics from BoggyCreekBeast.
BoggyCreekBeast: "Fire Roll Friction Fire (Rudiger Roll) Part 1"
http://youtu.be/Fv1Q2xh4IIs
BoggyCreekBeast: "The Fire Roll Part 21: No Tools or Ash"
http://youtu.be/n54at86f5wc
A couple from Edu Gordo,
Edu Gordo: "Fire Roll XI Cattail"
http://youtu.be/ZMskFHTBWqU
Edu Gordo: "Fire with Cotton and Ashes" - November 15th 2013
http://youtu.be/OeKalt1gwWo
This is a clip from a German tv show that aired December 2007 and Rene uploaded to YouTube on February 16 2008. This is the earliest video on the internet of the Rudiger Fire Roll that I have found so far. The PaleoPlanet thread I shared a link to in my previous post in this thread is the earliest mention of the Rudiger Fire Roll on the internet that I have found so far.
Rene "Baca" Ponya: "Survival Expert Rudiger Nehberg Lesson" - Rudiger Fire Roll from 00:49 through 1:15.
http://youtu.be/kJswRUbYYH0
Anyhow, I prefer Percussion Fire to Friction Fire as a day to day go to. Vastly less effort and much greater certainty of success in my experience. This link is Paul from Jungle Craft with an excellent article and video showing just a tiny fraction of what can be done with F&S in primitive/survival situations. I've been doing the same things with F&S for years here in the Upper MidWest.
Paul from Jungle Craft: "Advanced Flint and Steel"
http://www.junglecraft.com.my/index.php/advanced-flint-and-steel/