Yep, they apparently don't say it. Assuming that they put in the copperfill filament as much copper as they put bronze in their bronzefill, we can get a clue. Bronzefill has a density of 3.9g/cm
3. If the PLA or whatever they mix has a density of about 1.4, and bronze more or less 8.5, then 1.4*(1 - x) + 8.5 * x = 3.9 --> x = 0.35 more or less, which is consistent with the percentage used in wood-like filaments (I read between 30% and 40%). If it were 85%, it would probably break if you stare at it too intensely.
Edit: of course if you consider the weight instead of the volume, then you get that the metal is 75% of the filament, but I think this measure would be misleading.
Edited 1 time(s). Last edit at 12/03/2015 04:42PM by cristian.