Post-Processing 3D Prints: Sanding, Painting, and Finishing

From Printer to Professional

Raw 3D prints look like 3D prints. Post-processed prints look like injection-molded products. The difference in perceived value? 3-10x.

Step 1: Remove Supports and Clean Up

Use flush cutters for supports, then a hobby knife for small nubs. Sand the support marks with 120-grit sandpaper.

Step 2: Fill Layer Lines

Apply filler primer (spray) or automotive body filler for deep lines. Sand smooth with 240-grit, then 400-grit.

Step 3: Prime

Use a spray primer designed for plastic. Two thin coats, sanding lightly between coats with 600-grit.

Step 4: Paint

Spray paint gives the most even finish. For detailed work, use acrylic paints with brushes. Always apply multiple thin coats rather than one thick coat.

Step 5: Clear Coat

A clear coat protects the paint and adds a professional shine (or matte finish). Two coats of clear lacquer work well.

Time and Cost

Post-processing adds 30-90 minutes per part and €1-5 in materials. But a finished part sells for 2-5x more than a raw print.

Factor post-processing time into your labor costs using our calculator. At €15/hour, 45 minutes of finishing adds €11.25 to your cost.