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Adds an optional board lip — walls that hang below the stencil and wrap around the PCB edges so the stencil seats itself without manual alignment. - New edge cuts layer file input (Gerber and SVG) - Gerber edge cuts parser: stroke-based (D01/D02), chained segments into closed contours, arc interpolation (G02/G03 with I/J) - SVG edge cuts parser using existing path parser - Automatic board outline selection (largest closed contour wins, so interior cutouts and keychain holes are ignored) - Polygon offset (vertex-normal bisector) for inner/outer lip edges - When lip is enabled the stencil shape follows the board outline instead of a rectangle — no overhang beyond the PCB edge - STL export merges stencil + lip into a single solid geometry - Fix: strip trailing near-duplicate point from chained contours to prevent zero-length edge at vertex 0 causing missing wall at one corner Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
SVG2Stencil
3D print a solder paste stencil for any circuit board. Export the paste layer from KiCad as a Gerber or SVG file and get a custom STL file you can 3D print.
Optionally add a board lip — a wall around the edge of the PCB that lets the stencil seat itself automatically without manual alignment.
Usage
- Open
index.htmlin a browser - Export your paste layer from KiCad:
- Gerber (recommended): File > Fabrication Outputs > Gerbers, enable F.Paste
- SVG: File > Plot > F.Paste, select SVG format
- Drag and drop the file onto the paste layer drop zone (or click to browse)
- Adjust stencil dimensions:
- Width/Height: Overall stencil size (auto-sized to fit with 20mm margin)
- Thickness: Stencil thickness (default 0.12mm)
- Preview the stencil in the 3D viewer (drag to rotate, scroll to zoom)
- Click Download STL to save
Adding a board lip (auto-alignment)
A board lip adds walls that hang below the stencil and wrap around the PCB edges, so the stencil seats itself on the board without needing to be manually aligned.
- Export the edge cuts layer from KiCad:
- Gerber: File > Fabrication Outputs > Gerbers, enable Edge.Cuts — produces
*Edge_Cuts.gbror similar (.gm1,.gko) - SVG: File > Plot > Edge.Cuts, select SVG format
- Gerber: File > Fabrication Outputs > Gerbers, enable Edge.Cuts — produces
- Drag and drop the edge cuts file onto the Edge Cuts Layer drop zone
- The Board Lip section will appear with three controls:
- Lip Height: How far the wall extends below the stencil (default 1.2mm)
- Wall Thickness: Thickness of the lip wall (default 1.2mm)
- Fit Clearance: Gap between the lip's inner face and the PCB edge (default 0.15mm) — increase if the fit is too tight
- When the lip is enabled the stencil is automatically sized to the board outline — it won't extend beyond the edge of the PCB
If your board has interior cutouts (keychain holes, slots, etc.) the outermost contour is automatically selected as the board outline.
Supported File Formats
Gerber (RS-274X)
Accepts .gbr, .ger, .gtp, .gbp, .gm1, .gko, and other common Gerber extensions. Supports:
- Standard aperture types: circle (C), rectangle (R), obround (O), polygon (P)
- KiCad's
RoundRectaperture macro for rounded rectangle pads - Pre-instantiated aperture macros (KiCad 6+)
- Region fills (G36/G37) for polygon-defined apertures
- Stroke-based edge cuts with linear and arc segments (G01/G02/G03)
- Both metric (mm) and imperial (inch) units
SVG
Accepts .svg files exported from KiCad's plot function. Parses filled paths as paste apertures and stroke-only paths as edge cuts outlines.
Requirements
- Modern browser with WebGL support
- No installation or build step required
Notes
- Apertures smaller than 0.1mm are filtered out
- When the board lip is enabled the STL contains the stencil and lip as a single merged solid
- STL files may need minor repair for 3D printing (most slicers handle this automatically)