I made this thing a while ago, but I never posted it because it's silly. My girlfriend thought I should post it because "it's cute", so here it is. I originally made this as an analog ON/OFF indicator for my power supply. Placed next to my power supply, the blades spin from the cooling fan breeze indicating power is on. Here's a video of the turbine in action...

VIDEO---> flic.kr/p/a8WLnd

See, silly...

This thing is a printable ratcheting pulley block, designed for 550lb Paracord (other 1/8 inch or ~3.0 mm rope will likely work too, but I have only tried paracord). It allows you to easily raise and lower a hanging object. To see exactly what this thing does, please watch this short video...

VIDEO---> flic.kr/p/c4ujHG

This thing is a support for the z-axis smooth rods of the Prusa Mendel. Supporting the bottom side of the z-axis reduces the side-to-side wobble of the machine and produces surprisingly improved prints. In the image of the large print (part of thingiverse.com/thing:10526), I placed supports under the smooth rods about 3/4 of the way through the print, you can see the dramatic improvement.

The design uses M6 nuts and bolts to make the support adjustable. Using M6 x 18mm bolts, the feet are adjustable from 24mm - 36+mm. They require 3mm of smooth rod exposed on the bottom of the machine.

I'm open to design improvement suggestions, don't hold back! :)

UPDATE: Added SAE version for 1/4 inch nuts/bolts. A 3/4 inch long bolt is slightly longer than 18mm, so it will produce an adjustment range similar to the 18mm bolt described above. The .stl files for the SAE version have "SAE" in the file name, the metric versions have no designation.