Post‑Processing for 3D Prints

Loveland CreatorSpace — 3D Printing Guide

Post‑processing is the set of finishing steps performed after a 3D print is complete. These techniques improve appearance, fit, strength, and usability. This page introduces common tools, methods, and best practices for finishing PLA prints made on our Bambu Labs printers.

1. Why Post‑Processing Matters

• Removes support marks and imperfections

• Improves surface finish

• Helps parts fit together properly

• Allows for painting, smoothing, or assembly

• Extends the usefulness of functional parts

Post‑processing is optional for many prints, but essential for high‑quality or visually polished results.

2. Common Post‑Processing Tools

Hand Tools

• Flush cutters — trim supports, brims, and small artifacts

• Deburring tool — clean edges and holes

• Needle files — refine tight areas and internal corners

• Sanding sticks — controlled sanding for small surfaces

• Utility knife / hobby knife — scrape or trim imperfections

• Scraper — remove prints from the bed safely

Sanding Tools

• Sandpaper (120–400 grit) — smooth layer lines

• Sanding blocks — keep surfaces flat

• Flexible sanding pads — conform to curved surfaces

Heat Tools

• Heat gun — soften PLA slightly for bending or smoothing

• Soldering iron — embed brass inserts or repair small defects

Assembly Tools

• Super glue (CA glue) — bond PLA parts

• Epoxy — strong bonding for structural parts

• Brass heat‑set inserts — threaded metal inserts for screws

• Clamps — hold glued parts in place

Finishing Tools

• Primer — prepares surface for paint

• Acrylic paints — safe for PLA

• Clear coat — protects painted surfaces

3. Removing Supports

Step‑by‑Step

1. Start with flush cutters to remove large support sections

2. Use a deburring tool to clean edges

3. File remaining marks with needle files

4. Sand lightly to blend surfaces

Tips

• Remove supports slowly to avoid snapping delicate features

• Use pliers only when necessary — they can damage prints

4. Sanding & Surface Smoothing

Recommended Grit Progression

• 120 grit — remove major imperfections

• 220 grit — refine surface

• 400 grit — smooth finish

Wet Sanding

• Reduces dust

• Produces smoother results

• Helps prevent PLA from overheating during sanding

5. Heat‑Set Inserts

Heat‑set inserts allow screws to be used in PLA parts.

Steps

1. Heat a soldering iron to ~260°C

2. Place insert on the hole

3. Press gently until flush

4. Allow to cool before use

Tips

• Use a printed alignment jig for best results

• Avoid overheating — PLA can deform quickly

6. Gluing & Assembly

CA Glue (Super Glue)

• Fast, strong bond

• Works well for PLA

Epoxy

• Best for structural parts

• Longer working time

Clamping

• Use clamps or rubber bands to hold parts together while curing

7. Painting & Finishing

Priming

• Use filler primer to hide layer lines

• Sand between coats for smooth finish

Painting

• Acrylic paints work well on PLA

• Apply thin coats to avoid runs

Clear Coat

• Protects paint and adds gloss or matte finish

8. Safety Considerations

• Wear eye protection when removing supports

• Use a mask when sanding

• Work in a ventilated area when painting or using CA glue

• Heat tools can burn skin or deform prints — use caution

9. When to Ask for Help

Members should reach out if:

• A part needs repair after a failed print

• They want to embed hardware or inserts

• They’re unsure how to finish a complex model

• They want advice on painting or smoothing techniques

10. Orientation Completion

Members should demonstrate:

• Ability to remove supports safely

• Basic sanding and smoothing techniques

• Understanding of heat‑set inserts

• Knowledge of common finishing tools