better_stl

Making better .stl models

Better .stl by design

OpenSCAD

FreeCAD

Blender

...it's good to also do Normals->Recalculate Outside in the mesh menu after removing doubles, because sometimes triangles get flipped to become holes in that operation.

Fixing broken .stl models

Meshlab

http://vcg.isti.cnr.it/~dellepiane/Corso_2011/8_MeshLab_Mesh_Processing1.pdf

Netfabb

• Basic - http://www.netfabb.com/basic.php
• Cloud - http://cloud.netfabb.com/