Any 3D printer should ideally be a garage-use item if you have kids. For SLA printers, a good tip is to use clear resin and leave the print in direct sunlight for as long as it takes to cure the thing almost to its core. Still, with the cleaning and postprocessing on photopolymers, you're much better off with a FDM printer while you're sharing space with young children.

If I'm not mistaken, as long as your extruder and printer are all clean, recycling food-grade plastic into filament wouldn't remove its food-grade quality... Right?