This flexible back scratcher is actually a modification of the samurai sword I designed. One day, I thought about whether it could be designed as a large naginata. As I was working on it, the angles ended up like this, and it unexpectedly gained the functionality of being able to scratch the back. Haha. Similar to a samurai sword, when printing, attention should be paid to the following positions – make sure the retractions are well spaced and not too close together.