Neil MacDonald wrote:
When I import the part into solidworks, it has a number of surface faults and gaps that will not heal.
Can you attach the original STEP file here?
You are less likely to have problems if the 2013 user saves it as a Parasolid file instead of a STEP file. You might get the best results if they save it in the same Parasolid version as 2010 uses. (Try saving in 2010 and check the options to see which version to use.)