Even though Bambu Lab printers deliver some of the cleanest, sharpest FDM prints on the market, raw parts still look like… 3D prints. Layer lines, seam marks, or surface textures may be fine for prototypes, but for client work, display models, or consumer-ready parts, post-processing can transform prints from “good” to “polished.”
This post explores the most effective finishing techniques for parts printed on Bambu machines.
1. Mechanical Finishing
Sanding
- Start with 120–220 grit to remove layer lines.
- Progress to 400–600 grit for smoother finishes.
- Wet sanding works especially well on PLA and ABS.
Filing and Deburring
- Use hobby knives or small files to clean edges, supports, and seams.
- Particularly useful after removing tree supports from Bambu Studio.
2. Surface Smoothing
Filler Priming
- Apply filler primer spray to fill in layer lines.
- Sand after drying and repeat as needed.
- Works best before painting.
Epoxy Coating
- Apply thin epoxy resin (e.g., XTC-3D) for a glossy, smooth surface.
- Adds strength but increases weight.
Chemical Smoothing
- ABS: Acetone vapor smoothing creates a shiny, injection-molded look.
- PLA: Less responsive to solvents, but some specialized PLA blends can be smoothed with heat or chemicals.
3. Painting and Coloring
Primer
- Always prime before painting for better adhesion and even coverage.
Acrylic Paints
- Water-based, easy cleanup, wide range of colors.
- Apply multiple thin coats for best results.
Spray Painting
- Faster for large surfaces, ideal for models and props.
Masking for Multi-Color
- Even with AMS multi-color prints, painting allows finer detail and weathering effects.
4. Structural Post-Processing
Heat Treatment (Annealing)
- Heat-treating parts (especially PLA and Nylon) improves strength and heat resistance.
- Place part in an oven at ~80–100°C for 30–60 minutes.
- Expect slight shrinkage/warping; test with calibration pieces first.
Gluing and Assembly
- Use superglue, epoxy, or specialized plastic adhesives.
- For large models, pin joints with metal rods or dowels.
5. Specialty Finishes
- Hydro Dipping: Apply intricate film patterns over prints.
- Electroplating: With conductive paint, parts can be plated with real metal.
- Textured Paints: Add stone, metallic, or rubber-like finishes.
Pro Tip: Design with Finishing in Mind
- Include flat surfaces for sanding.
- Add alignment pins for easy assembly.
- Use modifier meshes in Bambu Studio to thicken walls where sanding/finishing is expected.
Final Thoughts
Post-processing is where 3D prints make the leap from hobby to professional-grade. Bambu Lab printers get you most of the way there with clean, fast prints, but finishing techniques give you the control to achieve commercial-ready results. Whether it’s sanding for smooth prototypes, painting for realism, or annealing for performance, the possibilities are endless once the print leaves the bed.
Zeltar Design 
Leave a comment