Iron

Metal Composite HTPLA

More metal + heat resistance! High Density Iron HTPLA Filament has 60wt% iron for 3D prints with 2x the magnetic force and 3x the temperature resistance (when heat treated) compared to Protopasta's original Iron PLA with 45wt% iron. Protopasta Iron HTPLA is ferromagnetic. It responds to magnets and behaves similarly to pure iron! Encapsulated in plastic, the iron maintains a stable matte, cast-metal finish as printed, but can be rusted when desired. Featured in September 2025's Endless Exploration Subscription Delivery. More about the contents in our EX10 blog. You can also visit our blog for more about metal finishing and heat treating.