ECAD > Working With ECAD Assemblies > Creating and Modifying Board Segments > Problems Previewing the Flat State
  
Problems Previewing the Flat State
A preview of the flat state does not appear for boards with the following geometry:
Two or more distinct pieces
Unmerged quilts
One or more deformation areas that cannot be unbent
Relief geometry that is not valid
Hem geometry that is not valid
Deformation areas that cannot be regenerated
Sharp edges that cannot be unbent
Surfaces that cannot be unbent