I was wanting to save the results of a filter to an Excel file today, and I found that the filter did not have a "Save As" button. I found an article here that explained it, but I modified the report slightly to fit my needs. I was looking for way to get the list of computers in my Patch Test Group Filter. I used this SQL query to create a report to then save as a .csv:

SELECT Distinct 

r.Guid AS '_ItemGuid', 

r.Name AS 'Resource', 

r.[User], 

r.[System Type], 

r.[OS Name], 

vItem.Name AS FilterName

FROM 

vItem INNER JOIN

CollectionMembership INNER JOIN

vComputerEx AS r ON CollectionMembership.ResourceGuid = r.Guid ON 

vItem.Guid = CollectionMembership.CollectionGuid LEFT OUTER JOIN

Inv_AeX_AC_Identification ON r.Guid = Inv_AeX_AC_Identification._ResourceGuid

WHERE

CollectionMembership.CollectionGuid = 'd0fae853-3129-490f-86fd-e8a8bc0162f2'

ORDER BY r.Name ASC

All you need to change on this report os the Guid for your required Filter (in the SQL its called a collection still...). You can get the guid of your Filter by right clicking on your desired Filter, and click on "Properties". This will give you the guid to put in this SQL query.