The smoke base is remixed from Pierre Muths model. The pillar is replaced by a solid that is printed in wase mode so there won't be any visible seams. On top is a small PCB that holds three LEDs and a SMD resistor. I've made a small rocket mount to be glued inside the rocket.
For a rocket I use this: https://www.thingiverse.com/thing:4045941
The author remixed this model.