Hi,
I'm the author of the Tweaker, an open-source Auto-Rotate module for 3D Objects in FDM Printing, which I've posted here some time ago. However, the latest version of the Tweaker has such an improved performance, along with a plugin for both Cura 15.04 and 2.3, that I want to repost it.
The Tweaker finds an optimal orientation for 3D printing, even for complex objects.
This object's optimal orientation was found in only 0.10 seconds in command line. This is an enourmous improvement compared to the previous version and it is now very smooth to use it directly in the GUI.
How to get the plugin:
For Cura-Users 2.3: Download the CuraOrientationPlugin and move the folder into the Cura's plugin directory. Thanks to Nallath for building the Plugin around the Tweaker.
For Cura-Users 15.04: You can replace the Cura's layflat function by the Auto-rotate function. Download MeshTweaker.py and the modified printableObject.py and move it into Cura's plugin directory.
Have fun with it!
Chris