Smoothing

Acetone Vapor Smoothing for ABS and ASA

ABS and ASA prints benefit from acetone vapor smoothing, a post-processing technique that enhances surface finish and water resistance. These materials dissolve in acetone, enabling surface molecules to redistribute into a glossy, injection-molded appearance.

Key Advantages:

• Aesthetic Improvement: Eliminates layer lines and creates a smooth, reflective surface.
• Functional Benefits: Increases water resistance and reduces part porosity.

Safety Precautions:

• Flammability: Acetone is highly flammable. Perform smoothing in well-ventilated areas away from open flames.
• Alternative Methods: Non-heated acetone techniques (e.g., cold vapor baths) reduce fire risks.

Process Overview:

1. Setup:

   • Suspend prints on a metal grate or fishing line inside a heat-resistant container (e.g., cooking pot).
   • Heat the container on a build plate or hot plate to 65–75°C until acetone vapor forms.
2. Exposure:

   • Limit sessions to 1–3 minutes to prevent deformation. Multiple short passes are safer than prolonged exposure.
   • For large prints, use a broiler setup with ventilation holes to ensure even vapor distribution.
3. Drying:

   • Air-dry parts for 30 minutes before handling.
   • Optional vacuum purging accelerates curing and strengthens bonds.

Post-Processing Notes:

• Overexposure Risks: Excessive acetone contact may cause long-term cracking.
• Uneven Results: Acetone vapor sinks, potentially over-smoothing lower sections. A small fan improves vapor circulation.

Polysher and Alcohol-Based Smoothing (PVB Filaments)

Polymaker’s Polysher system uses isopropyl alcohol (IPA) to smooth PVB-based filaments like PolySmooth. This method avoids acetone’s flammability risks but sacrifices mechanical strength and heat resistance.

Key Considerations:

• Material Limitations: Restricted to alcohol-soluble filaments (e.g., PVB).
• Safety: IPA is less flammable than acetone but still volatile. Avoid heating above 40°C.
• Alternatives:

  • Manual Spraying: Apply IPA with a misting bottle for localized smoothing.
  • Cold Baths: Submerge prints in IPA without heat for gradual smoothing.

Best Applications:

• Cosmetic Models: Ideal for miniatures, figurines, or display pieces requiring a polished finish.
• Avoid for Functional Parts: PVB’s lower heat resistance and mechanical strength limit structural use.

Polysher Limitations:

• Size Constraints: Limited to parts fitting inside the device’s chamber.
• Material Dependency: Requires PVB or similar alcohol-soluble filaments.

Summary Recommendations

• ABS/ASA: Prioritize acetone vapor for durable, heat-resistant parts with glossy finishes.
• PVB/PolySmooth: Opt for alcohol-based methods for safer, cosmetic-focused applications.
• Safety First: Always prioritize ventilation, fire safety, and material compatibility.