Post-Processing
Techniques
Transform your 3D prints into professional-quality finished products. Learn sanding, painting, smoothing, and finishing techniques.
Post-Processing Techniques
Choose the right technique based on your material, desired finish, and skill level.
Sanding
Remove layer lines and smooth surfaces for a professional finish
Tools Needed:
Steps:
- 1Start with coarse grit (120-220) to remove major imperfections
- 2Progress to medium grit (400-600) for smoothing
- 3Finish with fine grit (800-2000) for polish
- 4Use water for wet sanding to reduce dust
- 5Clean thoroughly between grit changes
Pro Tips:
- Work in one direction to avoid scratches
- Use circular motions for curved surfaces
- Don't skip grit levels - gradual progression is key
- Wear a mask to avoid inhaling plastic dust
Priming
Prepare surfaces for painting with primer to ensure good adhesion
Tools Needed:
Steps:
- 1Clean the print thoroughly
- 2Lightly sand with 400-600 grit sandpaper
- 3Remove dust with tack cloth
- 4Apply thin, even coats of primer
- 5Allow to dry between coats
- 6Lightly sand between coats if needed
Pro Tips:
- Use plastic-specific primer for best results
- Apply in thin coats to avoid drips
- Work in a well-ventilated area
- Prime all surfaces that will be painted
Painting
Add color and protection with acrylic or enamel paints
Tools Needed:
Steps:
- 1Prime the surface first
- 2Choose appropriate paint type
- 3Apply base coat in thin layers
- 4Add details and highlights
- 5Apply clear coat for protection
- 6Allow proper drying time
Pro Tips:
- Use acrylic paints for easier cleanup
- Thin paints slightly for smoother application
- Build up color in multiple thin coats
- Use masking tape for clean lines
Chemical Smoothing
Use solvents to dissolve surface layers for a smooth finish
Tools Needed:
Steps:
- 1Set up well-ventilated workspace
- 2Create vapor chamber with acetone
- 3Suspend print above liquid (not touching)
- 4Monitor smoothing progress carefully
- 5Remove when desired smoothness achieved
- 6Allow to fully dry and cure
Pro Tips:
- Only works with ABS and similar materials
- Test on scrap pieces first
- Monitor closely to avoid over-smoothing
- Use proper safety equipment
Filling & Putty
Fill gaps, holes, and imperfections with filler materials
Tools Needed:
Steps:
- 1Clean the area to be filled
- 2Apply filler with putty knife
- 3Overfill slightly to account for shrinkage
- 4Allow to dry completely
- 5Sand smooth with appropriate grit
- 6Prime before painting
Pro Tips:
- Use wood filler for large gaps
- Apply in thin layers for better adhesion
- Sand when partially dry for easier work
- Prime after filling to seal the surface
Clear Coating
Protect finished surfaces with clear protective coatings
Tools Needed:
Steps:
- 1Ensure surface is clean and dry
- 2Lightly sand with 600+ grit if needed
- 3Remove dust with tack cloth
- 4Apply thin, even coats
- 5Allow proper drying between coats
- 6Polish if desired for extra shine
Pro Tips:
- Use matte, satin, or gloss finishes as desired
- Apply in thin coats to avoid runs
- Work in dust-free environment
- Allow full cure time before handling
Material-Specific Techniques
Different materials respond better to specific post-processing methods.
PLA
Easy to work with, takes paint well, avoid high heat
Recommended Techniques:
PETG
Good surface finish, chemical resistant, harder to sand
Recommended Techniques:
ABS
Excellent for chemical smoothing with acetone
Recommended Techniques:
TPU
Flexible material, limited post-processing options
Recommended Techniques:
Safety Considerations
Always prioritize safety when working with post-processing materials and tools.
Ventilation
Work in well-ventilated areas when using chemicals or paints
Protective Equipment
Wear masks, gloves, and eye protection as needed
Chemical Safety
Handle solvents and chemicals with care, follow MSDS guidelines
Fire Safety
Keep flammable materials away from heat sources
Dust Control
Use dust collection and wear respirators when sanding
Storage
Store chemicals and tools safely, out of reach of children
Need Professional Post-Processing?
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