If by DIY you mean make one from a chainsaw chain, remember that a chainsaw runs in one direction and all the teeth are sharpened to cut in only one direction. The Pocket Chainsaw is designed with bi-directional teeth. That doesn't mean that a Stihl or Husky (et al) chainsaw chain couldn't be resharpened to cut both directions, but I'm not sure how that would be done -- don't have one in front of me.