Scanning Flexible & Soft Materials: Foam, Rubber and Gaskets with ShapeScan

ShapeScan works exceptionally well with rigid objects, but many real-world parts are not hard or flat. Foam inserts, rubber gaskets, leather parts and thin plastics all introduce a new challenge: they bend, stretch and deform.

This article explains how to reliably scan flexible and soft materials with ShapeScan, turning unstable physical parts into accurate digital outlines suitable for laser cutting, CNC routing or pattern making.

Why Flexible Materials Are Tricky to Scan

Unlike rigid parts, soft materials rarely sit perfectly flat on their own. Common problems include:

• Edges curling upward
• Stretching under their own weight
• Compression changing the outline
• Shadows that shift shape boundaries

If scanned incorrectly, the resulting vector may look fine visually but produce parts that do not fit when cut.

Common Flexible Materials You Can Scan

• Foam inserts and packaging
• Rubber and cork gaskets
• Leather and fabric patterns
• Thin plastic sheets (PET, PVC, acetate)
• Silicone mats and seals

Step 1: Flatten the Material Without Distorting It

The goal is to hold the material flat while keeping its natural shape.

1. Use light weights. Coins, washers or small metal blocks placed outside the contour work well.
2. Avoid stretching. Do not pull or tape the material under tension.
3. Use a backing sheet. Place the material on top of the ShapeScan A4 sheet, not directly on a textured table.
4. Let it relax. Give the material a minute to settle before photographing.

Step 2: Control Lighting to Avoid False Edges

Soft materials exaggerate shadows, which can trick edge detection.

• Use diffuse light from the side, not directly above
• Avoid hard shadows near raised edges
• Ensure even brightness across the entire A4 sheet
• Rotate the setup if one side looks darker

Step 3: Photograph in the Neutral State

Always scan the part in its unstressed shape.

• Do not compress foam more than necessary
• Do not flatten rubber beyond its natural resting shape
• Scan gaskets without bolts or fasteners installed

The ShapeScan outline should represent the part before assembly.

Step 4: Clean Up the Outline Carefully

Flexible materials often generate slightly fuzzy edges in scans.

• Smooth minor noise but keep overall dimensions
• Avoid aggressive simplification
• Check internal cutouts carefully
• Measure key dimensions against the real part

Laser Cutting vs CNC Routing Soft Materials

Laser Cutting

• Excellent for foam, cork and thin rubber
• Kerf compensation is critical
• Heat may slightly shrink edges

CNC Routing

• Better for thicker rubber and foam
• Requires strong hold-down methods
• Tool deflection can affect accuracy

Common Mistakes to Avoid

• Stretching material to “make it flat”
• Scanning while holding edges with fingers
• Ignoring shadows created by thickness
• Skipping test cuts

Real-World Use Case: Custom Foam Inserts

One of the most popular ShapeScan applications is custom foam inserts for tool cases.

1. Lay tools on foam sheet placed over the A4 template
2. Scan each tool outline individually
3. Offset outlines to allow easy removal
4. Laser cut foam in layers
5. Glue layers for depth

The result is a professional, repeatable insert with minimal manual drawing.

Conclusion: Treat Soft Materials with Respect

Flexible materials are absolutely compatible with ShapeScan, but they require a slightly different mindset. Instead of forcing the material into position, your goal is to support it gently and capture its natural shape.

With careful flattening, good lighting and minimal cleanup, you can reliably turn foam, rubber and soft plastics into accurate digital assets ready for production.