Printed the flexible inner ring in PP, this will make it survive the bending.
The other parts are in PLA, printed with a 0.2 nozze and 0.1 layer height. The "big" base took 7.5 hours to print.
There is a bit of play in the planet gears, I will try to print a slightly larger center gear and see if that helps.
PP is quite soft and not suitable as a bearing surface. I added the blue ring to stiffen up the PP part a bit. If it were to be adapted to be made in PP I would make the inner ring in two parts, one outer part in PLA that somehow attaches to the inner part in PP (or add a proper bearing). The flexible parts could be made a bit fatter too, for better rigidity.