I've been through Schiphol quite a few times with film without problem. They've been more understanding and professional than staff at Cardiff and Heathrow in my experience. Luck of the draw? I think staff are trained that anything out of the usual is suspicious, and carrying big film cameras has become increasingly unusual.

A family member visited me in Korea a couple of years back and did me a favour by bringing a batch of film I'd bought with her -unfortunately in checked luggage. The film turned out to be fine, that had gone through scanners in Cardiff and Schipol.

I've not had problems with film going through multiple carry on scans. Maybe fears of x-ray scanners might have been blown out of proportion a little, with regard to film.