Tests with the unequal angles shows that the quality of the print varies depending the position.
I have done a first test with this double twisted vase, but the model is full of artifacts, which show in prints, especially with some extrusion parameters.
Test was then done with this pentagonal twisted vase scale up 4 times.
It have been printed in spiral mode, 0.25 mm layers, in RepRapper PETG at 275°.
Small film You hear neatly the drumming noise inside the printer. Hopefully, this is less marked outside the printer.
On the left of the print
On the right of the print - This is history - problem solved with equilateral configuration