From what I was able to find out, Nylon 12 is FDA listed: http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?fr=177.1500
Another laser sintering site goes ahead to call it FDA approved: http://www.lasersintering.com/sls-material.php
Its melting temp is way higher than the water boiling point.
MSDS specifically asks to avoid inhaling or ingesting the dust though: https://www.shapeways.com/rrstatic/material_docs/msds-strongflex.pdf
For myself, I decided that the main food contact issue is dust - so I washed it super thoroughly with a brush before the first use.