Yes, the voluntary stuttering was something I learned in speech therapy as a young adult. It was very difficult for me, and my speech pathologist had me practice, say do it 3 times a week with people you don't know (for example with the cashier at a grocery store). This ultimately helped with my acceptance of my stutter which ultimately helped with better fluency. Another strategy I learned and use is blending. It is essentially talking in a way that blends all the words together in a very smooth, calm way. It sounds very robotic at the start but with practice can sound fairly normal. I am a teacher now and I use this strategy for reading aloud to the kids! In the end, what eventually helped me was acceptance and openness about my stutter. My speech pathologist had assignments for me to talk to my university roommates about it, and my new boyfriend (at the time), and my grandparents (who were never very open about it) and this, while extremely difficult, was how I became more confident and has helped with fluency. I am not fluent but I manage it. I still stutter on my name almost every time I say it, but now when someone laughs and makes a "you don't know your own name?" joke, I smile and politely tell them I have a stutter. It still doesn't feel good but it helps me feel better about it and helps others around me to understand it better.