Object Count

OBJECT COUNT (LAST & SHOE) 

The Object Count check will verify if Shoe and Last STLs contain a single mesh object.  

When Rejected:

Please check if the mesh geometry can be split in separate objects before exporting as STL. Common issues, you have separate parts of the whole, you should join these meshes to a single mesh or you have floating objects, you should select only the shoe or last mesh object to be exported. 

OBJECT COUNT TIP:

In Blender edit mode, select your object and go to menu:

“Mesh > Separate > by loose parts” may reveal your object is not a single object.