by Victor-Calixto·Workflow
Images © Victor-Calixto. Used for product review; image policy.
Section Toolbox stands out in the Blender Extensions library for pairing live, parametric section controls with view-aligned SVG and DXF exports, with cut faces, projections, and elevations all versioned into tidy nested collections.
Section Toolbox (STB) is a Blender add-on by Victor-Calixto for generating parametric section boxes and planar sections. It creates cut and projection or elevation lines that are occlusion-aware, meaning near geometry hides far geometry, plus filled cut faces for closed loops. Each run is versioned and organised into nested collections.
The Section Box tool fits a box to the current selection using evaluated bounds with modifiers included. Anchors per axis (Center, −, +) pin faces while resizing, and Width, Depth, Height, Move, and Rotate update live with no apply step. Picking a face (±X/±Y/±Z) generates a _cut, the exact intersection clipped to the face rectangle, and a _projection, orthographic edges inside the box slab with hidden-line removal.
Planar Sections create cutting planes in XY, XZ, or YZ, with a Direction (+N/−N) and Depth that define the elevation slab and live Size U/V sizing with anchors. Exports cover SVG with thin 0.25 strokes and filled polygons for closed cuts, and DXF as pure 2D LINE entities at Z=0. Orientation comes from a saved Frame2D, with Flip X and Flip Y toggles.
Section Toolbox is best for blender users producing 2D section drawings, cut and projection lines, and CAD-ready SVG or DXF exports from 3D geometry.
Section Toolbox is completely free to download and use.
Section Toolbox is listed as compatible with Blender 4.2 LTS and newer, so recent 4.x releases are covered. It works as a Blender add-on that generates parametric section boxes and planar sections, with live Width, Depth, Height, Move, and Rotate controls and no apply step. If you are on an older Blender release, check the developer's GitHub page before installing to confirm support for your version.
Section Toolbox is listed as free in this catalog and released under the GNU General Public License v3.0 or later. That license covers how you can use, modify, and redistribute the add-on, and it means the source code is openly available on the developer's GitHub. For the current licensing terms and the source, see that GitHub page, since license details and versions can change over time. If you want to build the add-on yourself, the developer documents CLI build usage for packaging the extension.
Section Toolbox exports to SVG and DXF. SVG output uses thin 0.25 strokes with filled polygons for closed cuts, while DXF is written as pure 2D LINE entities at Z=0 so drawings open in CAD without extra flattening. Orientation comes from a saved Frame2D so exports stay view-aligned, and Flip X and Flip Y toggles let you match your drawing convention. You need to generate a section run before exporting, since exporters target the most recent run.
Section Toolbox generates cut and projection or elevation lines that are occlusion-aware, so near geometry hides far geometry within the slab. Version 0.0.2 uses BVH tests for more robust hidden-line removal, with configurable Visibility Samples and HLR Epsilon. If hidden lines still show, increasing Visibility Samples while keeping HLR Epsilon small can help. Projection edges sit inside the box slab and apply hidden-line removal.
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