I posted this in May of 2016 on another forum in this link.
https://www.tapatalk.com/groups/paleoplanet69529/fire-roll-and-cord-drill-t63683.htmlThere is a list of vids that I found to be the most helpful when first learning this method in the link above.
My post mentioned above:
Been meaning to post about the Rudiger Fire Roll since at least the winter of 2014/15. Before that had heard of the concept yet was unable to locate any written or video how to's. This is what I had written back then but never posted here:
Anyone experimenting with the Rudiger Roll technique? This simple, easy, quick friction fire technique is also known as the Fire Roll aka Wool Skating aka Fire Skating. As far as I have been able to find so far this technique was first posted on the internet to PaleoPlanet on 12/23/2007 in posts #11 and #13 of this thread:
http://paleoplanet69529.yuku.com/topic/2770/Fire-by-all-possible-ways Post #11 cites German TV. Post #13 cites this vid posted to YouTube by Rene "Baca" Ponya on 02/16/2008 of a German TV clip that aired in 2007.
The brief backstory is Rudiger Nehberg, a German survival instructor, is universally credited with spreading this technique. There are rumors that people in WWII concentration camps used this method. BoggySwampBeast credits Gullrica with naming it the Fire Roll. Grigory1, BoggySwampBeast and Edu Gordo are the current masters of this technique having the most vids using the most materials. Tletlcalli Casa del Fuego and Rene "Baca" Ponya also have some good vids on this technique. David West has some instructional videos on the Rudiger Roll.
While it may not be documented to have been connected to any primitive cultures, the Rudiger Roll has been amply documented to easily make an ember on the spot with entirely natural materials gathered in situ using only paleo tools.
So far I have been successful with cotton plus ashes and milkweed stem fibers plus ashes. Grigory1 points out that overly processed cotton (such as medical grade) does not work as well as more natural cotton fluff. Dozens of natural fibers and grits/accelerants have been successfully used. Grits or accelerants are not necessary with all fibers but do tend to make achieving an ember faster and easier. Smaller, tighter rolls (such as using 1/3 of a cotton ball rather than a whole one) tend to work better.