Well known tool in the community of 3D artists named 3D Coat, recently upgraded to version 4.1.
Well, visit the gallery, google it, read on forums, look at the features and watch some videos on youtube: it is amazing! (oh, and try the free demo here)
3D Coat 4.1 has been improved for 3D printing process, to simplify the creation and the management of tolerances in pieces joints.
[ot-video type=”vimeo” url=”https://vimeo.com/22342702″]
We could write here the long list of features and improvements of release 4.1, but it would be a mere copy/paste because they are quite impressively explained on the developer’s page here.