Iron Fill
Proto-pasta
195–220
°C
Print Temp
25–60
°C
Bed Temp
50
°C
Max Service
Overview
PLA-based filament with high iron content that can be rusted with vinegar and salt solution for an authentic aged steel appearance. Magnetic to strong magnets. Heavy density similar to cast iron.
Properties
Difficulty
advanced
Flexibility
rigid
Layer Adhesion
fair
Enclosure
no
Heated Bed
no
Dry Storage
required
Pros
- Can be rusted for authentic aged look
- Magnetic (strong magnets)
- Heavy, convincing metal feel
- Can be polished
- Unique aging patina
- Great for prop making
Cons
- Extremely abrasive — destroys brass nozzles
- Very slow print speeds
- Rust treatment takes time and care
- Not waterproof long-term (will corrode further)
- Expensive
Best For
- Weathered prop making|Industrial aesthetics|Magnetic parts|Costume props|Display pieces
Avoid For
- Standard nozzles|Outdoor permanent use|Any functional structural purpose
Storage
Store with desiccant. Iron fill can begin rusting inside the bag if stored in humid conditions — preventable with sealed storage.
Brands
Proto-pasta Iron FillColorFabb SteelFill