Protopasta Rustable Magnetic Iron PLA vs Spectrum PLA Metal Filament Brass

Pick the Protopasta iron composite if you want a print that behaves like metal: it is ferromagnetic, 1.5x the density of standard PLA, and can be rusted on purpose. Pick the Spectrum brass PLA if you want an easy decorative print with a warm brass look and no special handling. The iron one is the fussier material: more abrasive, slightly more brittle, and it needs a hardened nozzle and slower speeds. Owners of the iron filament praise the finish and say it prints close to normal PLA once tuned; Spectrum buyers get the simpler, more forgiving print.

• Choose the Protopasta iron composite if you want magnetic, heavy-feeling parts with a cast-metal finish you can rust for an aged look.
• Choose the Spectrum brass PLA if you want a brass-look decorative print that runs on standard PLA settings with little tuning.