If you can stand the speaker voice and format, it's quite impressive on the machinists part. This clip unfortunately ends before the contest is finished but SPOILER he makes it through the whole 6cm. The EDM guy gets 12mm in. I'm sure that graphite will behave much differently to most metals that we use in watchmaking regarding cutting pressures and grabbing tendencies but his setup is interesting. There is a follow up clip on YouTube as well.

https://www.youtube.com/watch?v=mQAkJ-L1iVw