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
- Edit – Make Solid