I did it as part of a speech therapy course. I haven't kept it up. You ask if this reduces your stuttering, I doubt it would on its own. A lot of people that stutter have a fear of stuttering and it is this fear that leads to avoidance and more stuttering. Voluntary stuttering is meant to help you be more comfortable stuttering. It also allows you to better view how others react when you are choosing to stutter without the associated struggle. I thought it was interesting to do but by the time I did it, I was relatively accepting of my stutter. If you get anxious talking and are worried about stuttering in front of others then g-g-give this a go (that is how i would add a voluntary stutter). Choosing to stutter can feel empowering and help give some perspective to our problem. I would not make this the focus of my recovery. It is a tool. A reminder that stuttering can be OK. In my opinion recovery requires a positive mentality, a strong focus on acceptance, and the discipline to talk slowly and clearly while eliminating bad talking habits. I think the secret weapon is to connect with other motivated stutterers so you can help each other stay on track.