SVG vector drawings & STL 3D-printable models

SVG and STL are about communication, not fabrication. SVG goes in your presentation deck, your brochure, your website, or your laser cutter. STL becomes a tabletop reference model you can hand a client across a desk.

SVG — editable vector graphics

The SVG export is a ZIP archive containing one SVG file per sheet from the construction PDF — plan view, elevation(s), and every workshop sheet. Every line, polyline, and dimension label is a real vector element you can re-style, recolour, scale infinitely, or extract individually. There’s no rasterisation anywhere in the pipeline.

What’s inside the SVG file

Each SVG mirrors its PDF sheet 1:1, with these structural properties:

• Grouped by layer — every layer from the DXF (TREADS, STRINGER, BALUSTERS, HANDRAIL, DIM, …) becomes a named <g> group in the SVG. In Inkscape and Illustrator, these show up as layers in the Layers panel.
• Real units — the SVG viewBox is set in millimetres (or inches, depending on calculator unit) so anything you measure in the editor matches the physical staircase 1:1.
• Selectable text — dimension labels are actual <text> elements, not vectorised paths. You can change the font, size, or colour without losing the value.
• Clean stroke widths — line weights match the PDF (heavy for outlines, light for dimensions). Scale the drawing and the strokes scale with it.

When to use SVG

• Client presentations — drop the elevation SVG into a Keynote, PowerPoint, or Figma slide. It stays crisp at any zoom level.
• Brochures & brand styling — open in Inkscape or Illustrator, recolour to match your brand palette, add logos, re-export as PDF.
• Website embeds — inline SVG in your marketing page so the staircase scales perfectly across retina and mobile screens.
• Laser cutting — both DXF and SVG export translate to a laser cutter; SVG is the friendlier path if your laser software (Lightburn, Glowforge, Beam Studio) prefers vector graphics.

Quick Inkscape workflow

1. Download the SVG bundle from the calculator and unzip it.
2. Open the sheet you want in Inkscape (free, open-source).
3. Open the Layers panel (Object → Layers). Toggle off layers you don’t need (e.g. hide DIM for a clean reference image).
4. Select all (Ctrl-A) and apply a new stroke colour or fill if you’re restyling.
5. Export as PNG (File → Export PNG Image) for a presentation, or save as SVG for further use downstream.

STL — 3D triangulated mesh

The STL export is a single binary STL file containing the entire staircase as one watertight triangulated mesh. It’s the format every 3D printer slicer reads natively. Use it when you want to hold a physical model of your design in your hand before a single piece of lumber is cut.

What’s inside the STL

• Single combined mesh — unlike STEP, the STL carries no part separation. Stringers, treads, risers, balusters, handrail, and newels are all welded into one continuous mesh.
• Watertight & manifold — generated from the same authoritative BREP geometry as the STEP, then triangulated. No naked edges, no internal faces, no holes a slicer would refuse.
• Real-world coordinates — the STL is at full size (millimetres) by default. You’ll scale it down in the slicer for printing.

3D-printing workflow

1. Open the STL in your slicer (PrusaSlicer, Bambu Studio, Cura, OrcaSlicer — pick whichever your printer uses).
2. The mesh imports at full size — typically 2–4 metres per side. Scale uniformly to ~5–10% to get a 200–400 mm desktop model. Most slicers have a single-input scale field for this.
3. Orient the model so the staircase’s footprint sits on the print bed. The default orientation already has the foot at Y = 0, which is usually correct.
4. Recommended print settings for a desk model: 0.2 mm layer height, 15% infill, supports OFF (the staircase geometry is self-supporting if printed footprint-down). A 1:30-scale L-shaped stair prints in roughly 4–6 hours on a typical FDM machine.
5. Slice, save G-code, print. Sand lightly to take the stair-step artefacts off the treads if you want a hero model for a meeting.

What STL can NOT do

STL has well-known limitations — knowing them up front saves frustration:

• Not parametric. An STL is just a list of triangles. You cannot edit a dimension in CAD by opening an STL — for that you need the STEP export.
• No assembly hierarchy. Every part is welded into the same mesh. If you need to select a single tread in CAD or CAM, use STEP, not STL.
• Not for fabrication. STL is for visualisation and 3D printing. For actual CNC work, use DXF (2D) or STEP (3D).

Related exports

• PDF — eleven dimensioned A3 sheets ready for the workshop. See Construction PDF.
• DXF + STEP — 2D vector geometry for CNC and 3D solid geometry for CAD modelling. See CAD & CNC exports.