Monitor Spinner II -- Template

PDF here.
This is the underside. Solid lines are cuts. Fold dash lines down, fold dash-dot lines up. Grey is discarded. The thin rectangular notches at top and bottom are to locate the ends of the fold from the other side (!). You get the idea. Make it look the photo. The sides are sloped to catch the air like a propellor. The center is a valley/peak fold to capture the pivot, the notched arms fold down to encompass the pivot shaft.
My pivot is made from a "Panel Wall Wire Hook", like this.

YouTube videos of them both spinning here and here.

Note that placement along the top of the LCD panel may make a difference to the RPM's. Some places seem hotter than others.