Release v26.3.0

[Copilot]

First release of March 2026, covering 19 PRs (#164–#182) merged since v26.2.2.

Version

• package.json: 26.2.2 → 26.3.0

CHANGELOG highlights

Added

• Tree support roots (Add roots component to tree support for improved base stability #178) — 45° root structures for base stability; broadened ray-cast (ROOT_RAY_SAMPLE_FRACTIONS) for curved surfaces; hanging roots suppressed in everywhere mode
• Sequential wall printing for nested objects (Sequential wall printing for nested (matryoshka) objects #170) — outer-to-inner level ordering with nearest-neighbour within each level

Changed

• Lightning infill (Improve lightning infill: asymmetric fork positions and zig-zag kinks #169) — asymmetric fork positions (35–45% / 55–65%) + zig-zag kinks via addKinkedLine
• Tree support cross-sections (Revamp tree support: anatomically-correct trunk → branch → twig structure at ≤45° with circular cross-sections #172) — circular O+X shape, size varies by type, single shared trunk segment, translation-independent clustering
• Raft per-region separation (Optimize raft adhesion: separate rafts per contact region, shrink default margin #176) — independent raft per contact region; default margin 5mm → 3mm; edgeEpsilon = 0.001 for boundary float imprecision

Fixed

• Gizmo visibility on first model click (fix: restore gizmo visibility on first model click #164)
• Smart wipe never activating (_meshBounds vs meshBounds) (Fix smart wipe nozzle never activating during slicing #165)
• Inverted pyramid covered-region detection (below-case in findCoveredRegions) (Fix fully covered region detection for inverted pyramid shapes #166)
• Concentric infill bleeding into holes (edge-by-edge clipLineWithHoles) (Fix concentric infill generating inside holes (dome/cavity cross-sections) #167)
• String setters silently ignoring valid mixed-case input (setSupportPlacement, setSpeedUnit, etc.) (Fix case-insensitive input handling for all string setters in accessors #168)
• Nested object middle layers spuriously getting skin (Sequential skin printing for nested objects (matryoshka) #171)
• Oversized covered-area skin wall exclusion gap (should be infillGap, not nozzleDiameter) (Fix oversized skin infill gap at covered area (fully-covered region) skin wall #173)
• Test suite broken by three-mesh-bvh@0.9.9 circular reference; replaced three-bvh-csg with ExtrudeGeometry (Fix failing tests after three-mesh-bvh upgrade to ^0.9.9 #174)
• Sphere poles generating full-circle skin (raised candidateRatio 0.9→0.97, filter threshold 0.9→0.99) (Fix sphere pole layers generating full-circle skin instead of ring skin + center infill #175)
• Orphaned tree twig segments; weak twig/branch joint (TWIG_OVERLAP_LAYERS = 1) (Fix orphaned twig segments and strengthen twig/branch joint in tree support generation #177)
• Lego brick non-parallel skin lines — removed separate Phase 1 skin wall section; explicit G0 correction after combing (Fix lego brick bottom-layer skin infill non-parallel lines issue #179)
• Tree support trunk relocation false-negative on upright arch/dome (maxZ-aware isTrunkAccessible) (Enhance tree support buildPlate mode to reach overhangs blocked from below via trunk relocation and relaxed branch checks #180)
• Sibling nested structures not printing sequentially (precomputed directChildHolesOf/directChildStructuresOf) (Fix sequential printing for sibling nested structures at the same nesting level #181)
• Small covered regions (~2% area, e.g. lego studs) failing detection — removed 10% lower bound from findCoveredRegions (Fix: small covered regions (e.g. lego studs) not detected as fully covered on transition layers #182)

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[Copilot]

Pull request overview

Prepares the v26.3.0 release by bumping package versions and adding a detailed changelog entry covering the March 2026 batch of merged PRs.

Changes:

• Bump version to 26.3.0 in package.json and package-lock.json.
• Add 26.3.0 release notes to CHANGELOG.md.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 2 comments.

File	Description
package.json	Updates published package version to 26.3.0.
package-lock.json	Keeps lockfile metadata in sync with 26.3.0.
CHANGELOG.md	Adds the 26.3.0 release entry with Added/Changed/Fixed highlights.