I was inspired by a recent model upload to create a parametric paint mixer. This model with associated Fusion 360 CAD file turned out really well. You can customize the width, height, blade thickness, bore hole diameter, bore hole length, number of blades and number of turns each blade makes.
The supplied pre-generated mesh models are for a ¼" dowel, I use bit of painter's tape in the end for a tight fix or epoxy.
Update: added a pre-generated LARGE size 120mm diameter, 150mm tall

Here are two different designs I generated and printed, the blue one is the default if you use the CAD file.

Attached to a ¼" dowel, turning:
Demo (water):
Inspiration: https://www.printables.com/model/363966-mixer
The author marked this model as their own original creation.