White Strong Flexible (WSF) which is also known as Nylon 12, and has a MSDS listing of this:
Section 11 - Toxicological Information
ROUTE OF EXPOSURE
Skin Contact: May cause skin irritation.
Eye Contact: May cause eye irritation.
Multiple Routes: May be harmful by inhalation, ingestion, or
skin absorption.
SIGNS AND SYMPTOMS OF EXPOSURE
To the best of our knowledge, the chemical, physical, and
toxicological properties have not been thoroughly investigated.
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If the government-required documentation doesn't specify what will happen, you can bet that Shapeways does not have the resources to do a clinical trial to find out what would happen if you ingest some of these materials.
Use common sense: don't print items designed to contain or serve food, and don't eat food that has been in contact with items that have not been rated as food-safe.