# 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.


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