Wax and Burnout Filaments for FDM / FFF Printing

Wax and burnout-style filaments are used for investment casting, lost-wax-style workflows, jewelry, art casting, dental-style patterns, prototype castings, and specialty metal casting work. These materials are designed to print a pattern that can be invested and burned out before metal is poured.

Polymaker’s PolyCast is one well-known example. Polymaker describes PolyCast as a filament designed specifically for investment casting patterns, using ash-free technology with very low ash residue after burnout.

Where Burnout Filaments Work Well

Burnout filaments can be useful for:

• Investment casting patterns
• Jewelry casting
• Art casting
• Small metal components
• Prototype castings
• Complex wax-replacement patterns
• Low-volume metal parts
• Casting experiments
• Pattern development

They are especially useful when traditional wax injection tooling would be too slow or expensive.

Benefits

Burnout filaments can help reduce:

• Wax tooling cost
• Lead time
• Pattern-making bottlenecks
• Design iteration delays
• Cost for low-volume casting patterns

They can also allow complex geometry to be printed directly as a consumable pattern.

Important Process Considerations

A clean burnout process depends on more than the filament.

Important factors include:

• Pattern geometry
• Wall thickness
• Infill strategy
• Venting
• Investment material
• Burnout schedule
• Furnace capability
• Ash residue
• Shell strength
• Foundry process
• Metal being cast

For foundry work, the filament is only one part of the process. The burnout schedule and investment system matter heavily.

Wax-Like vs Burnout-Specific Materials

Not every “wax-like” filament behaves like injection wax. Some are blends. Some are PVB-based. Some are designed for cleaner burnout than ordinary PLA. Some may expand, soften, ash, or leave residue differently.

Before using a burnout filament for important casting work, test:

• Burnout behavior
• Ash residue
• Surface finish
• Shell cracking
• Dimensional accuracy
• Pattern strength
• Handling durability
• Foundry compatibility

JaegerTech View

Burnout filaments can be powerful for investment casting, but they require process discipline. For sand casting, a reusable 3D printed foundry pattern may be more practical. For investment casting, burnout filament may make sense when clean burnout, geometry, and low-volume pattern production justify the workflow.