Finally had the time to take some of the topics from my blog post about design for #3Dprinting and make them into a proper #FreeCAD addon!
You can download "FusedFilamentDesign" from the FreeCAD addon manager.
Also check it out here: https://github.com/rahix/FusedFilamentDesign
(This addon also integrates the macros I mentioned here a few weeks ago)