Convert drawing to stl file

Steps:

1. Original

Image

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Max dimension 1000

Instructions

Step 1: Use the tool to pick multiple color samples from the image foreground (FG) and then image background (BG).

Step 2 (optional): Use the tool to paint areas as background or foreground.

Step 3 (optional): Set scale distance and drag the scale-line handles (in Pan mode) to calibrate for real-world units.

Click Compute when ready to extract contours.

Scale

Scale distance mm

Foreground vs background probability from color model.

Color model

Bilateral filter Lightness weight 0.70 Foreground prior 0.50 Distance clamp 300 Regularization 0.08

Binary mask: above threshold = foreground. Morphology cleans edges.

Threshold

Cutoff 0.50

Cleanup

Morphology Kernel size 3

Edge refinement toward the true boundary.

Shape size filter

Ignore shapes < off

Ignore holes < off

Subpixel

Subpixel refine Iterations 5

Sharp corners from line fits; gentle curves stay smooth.

Corner detection

Corner finding Fit radius 15 px Max angle 120° Fit fraction 0.75

Reduce vertices for cleaner export.

Simplification

Simplify Tolerance ε 0.8 Outlier mult 3.0

These are the simplified contours you will export.

STL thickness mm