I am thinking of using it for a project or two but am still somewhat new to this.
So, I was wondering what are the advantages and disadvantages of Eryone's 15% metal PLA and X% metal PLA in general?
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Advantage: It should print like regular PLA at PLA temperatures.
Disadvantage: the embedded metal particles are abrasive and will widen your standard brass nozzle over time. The fix is to use a hardened steel nozzle, or for the extreme, there are options like ruby-tipped nozzles.
Advantage: It should look "metallic" in a way that is more durable than a paint-on topcoat finish, with a depth instead of a surface-only appearance.
That latter one is available in gold, bronze, copper, silver, etc. which sounds like metal, but only printing some will show you in person what it looks like.