You will not be able to mold that as a typical 2-sided mold. With a helix thare's always the issue of negative draft/undercuts. You will need a spinning core, and even then, because of the change in pitch, it might not work. Depending on how soft the material is, you MIGHT be able to, with a ton of radial slides, pop th epart out with proper sequencing, but it goes back to the elasticity of the plastic.
Best of luck.
