Bronze Filament Problem
Since we do not know more about the printer and its settings it is most likely that the issues lies within the printer and the temperature/print speed settings. Fill materials do print differently than just colored plastic of the same type. Find valid print parameters for the type of filament that you can modify as needed for the printer that is being used (a good first gauge are the offsets the printer has for other type of filaments (thermistors might be offset for example) added to the 'literature values' of the new filament).

It might also be, that the nozzle was not clean when changing filaments and hence the clogging occured. Have you/your printing guy tried a 'cold pull'? How should I clean my extruder when changing materials?

Usually nozzle clogging comes down to knowledge about your printer and experience with the filament.