Repairing STL files for Simplify3D printing using Meshmixer

http://www.meshmixer.com/download.html

• To level with bed
  •  Analysis – Layout/Packing
• To create solid from overlapping meshes
  • Edit – Make Solid
    • Solid Type: Sharp Edge Preserve
    • Solid Accuracy: ~400 – These can be tweaked depending on scale of your mesh
    • Mesh Density: ~400
  • Hit update – this may take awhile