this is a VAWT I made at the local fablab(protospace)
according to the labmanager the twist in the blades removes the pulsating noise
the normal darieus makes.
it`s made in openscad but the code is a little messy.(apart from openscad I only wrote some hello world like things for python tutorial exercises)
print the turbine on your printer of choice.
attach it to a tight fitting rod (use glue if necessary).
mount it on a stand and put it in the wind.