BronzeFill is excellent. Expensive, but excellent. If you want the weight and feel of metal it is ideal. If you just want the metal surface then the electroplating is a much cheaper alternative. In fact, once we have conductive filament it will be an EASY and safe alternative. The only real downside to it at present is the chemicals needed to get the graphite layer onto the plastic for the start of the plating process. Those are not healthy for children and other living things. Given that you could electroplate with batteries (rather than a special power supply) it could be even cheaper.