SVG image extruder

This script allows you to take a 2D SVG image (for example, a logo, icon, or simple vector shape) and extrude it into 3D.
You can also place it on top of a background plate to create badges, nameplates, keychains, etc.

🔹 How it works

• The script loads your SVG file and scales it to a specified width (in millimeters).
• You define the aspect ratio of your SVG (height ÷ width) so the script knows how tall to make the background plate.
• The foreground (your SVG) and the background (optional rectangle plate) are extruded separately, so you can control their thickness and preview them in different colors.

🔹 Preparing your SVG

• Your SVG should be pure vector paths (no strokes, filters, text, or clipping masks).
  • In Inkscape: select everything → Path ▸ Object to Path.
  • For stroked lines: use Path ▸ Stroke to Path.
  • Merge overlapping shapes with Path ▸ Union.
• Look at your SVG’s <svg> tag or viewBox to find the width and height values.
  • Compute ASPECT_RATIO = height ÷ width.
  • Example: if viewBox = 0 0 200 100, then ASPECT_RATIO = 100/200 = 0.5.

🔹 Parameters you can edit

• WIDTH → how wide your final logo should be (everything scales from this).
• ASPECT_RATIO → ratio from your SVG file. If your SVG is twice as tall as it is wide, use 2.0.
• SVG_EXTRUDE → thickness of your logo.
• SHOW_BG → turn background plate on/off.
• BG_EXTRUDE → thickness of background.
• BG_MARGIN → how much larger the plate is than the logo.
• Colors → only affect the OpenSCAD preview (STL export has no color).