Shapeways Disclaimer

What's the reason for not coming in contact with electricity? And how do they have coffee mugs here when they are not food safe? Or I'm missing something.. thanks.

"Please note that the 3D printed products are intended for decorative purposes. They are not suited to be used as toys or to be given to underage children. The products should not come into contact with electricity and be kept away from heat. Our materials, except for 3D printed glazed ceramic, are not food safe."

About food safety I've read somewhere that the only suitable material is ceramics, so you can make cups out of it

For the metals, this should be obvious. For the other materials, even if non-conductive, shapeways would probably
have to pay for certification by some recognized authority to be able to specify supported use cases. (Even then - up
to which voltage/current rating, and who takes the liability when the material is claimed safe but a part is constructed
such that the user is not sufficiently shielded from live wires, etc.)

As to your other question, the sentence you quoted explicitly names glazed ceramics as food safe. There may be ways
to make the sintered plastics food safe as well - primarily you need a non-toxic, non-leaching, easy to clean surface - but
they are not as simple and universally recognized as glazing ceramics.

It's all to do with certification as mkroeker points out.

Paul
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None of the plastics Shapeways supplies are reliable insulators. The various detail materials soften at low temperatures and WSF is porous and could hold moisture.