diff --git a/CHANGELOG.md b/CHANGELOG.md
index e17236fbf..6acf9fab2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,9 @@
 
 All notable changes to Bambuddy will be documented in this file.
 
-## [0.2.4b3] - Unreleased
+## [0.2.4b4] - Unreleased
+
+## [0.2.4b3] - 2026-05-08
 
 ### Added
 - **Slicer Bundle (.bbscfg) import — pick presets from a stored bundle instead of resolving cloud/local/standard PresetRefs every slice** — Closes the long tail of preset-resolution corner cases (cloud presets behind login, "from User" sentinel handling, the `# `-prefix clone trick, dangling `inherits` on renamed parents, etc.) by letting users upload a BambuStudio "Printer Preset Bundle" (`.bbscfg`) once per printer and pick from it for every subsequent slice. **Service layer (`backend/app/services/slicer_api.py`):** `BundleSummary` / `BundleNotFoundError` types, `import_bundle` / `list_bundles` / `get_bundle` / `delete_bundle` methods, `slice_with_bundle` which posts `/slice` with bundle id + per-category preset names instead of the JSON triplet. **Routes (`/api/v1/slicer/bundles`, all gated on `Permission.LIBRARY_UPLOAD`):** `POST` / `GET` / `GET :id` / `DELETE :id`. All routes proxy via `_resolve_slicer_api_url` so they follow the user's `preferred_slicer` setting (bambu_studio vs orcaslicer). Status-code mapping treats sidecar 4xx as 400, `BundleNotFoundError` as 404, sidecar unreachable as 503, and sidecar 5xx as 502. **Preview-slice (`backend/app/services/slice_preview.py::get_preview_filaments`)** picks up optional `bundle_id` + `printer_name` + `process_name` + `filament_names` params and routes through `slice_with_bundle` when set; the cache key picks up a bundle-context fingerprint so different bundle picks on the same file occupy distinct entries — gram numbers in the preview now match what the real print will produce instead of being derived from the file's embedded process settings (which can drift from the triplet the actual slice would use). The `library.py` and `archives.py` `/filament-requirements` routes forward the new params. **Dispatch (`SliceRequest.bundle: SliceBundleSpec`):** when set, `_run_slicer_with_fallback` skips `resolve_preset_ref` and calls `slice_with_bundle`; the validator skips the preset-required check so bundle-only requests validate. 3MF + bundle CLI 5xx still falls back to the embedded-settings slice path (`used_embedded_settings=True` surfaces in the response), and sidecar 404 (unknown bundle / preset name) maps to 400. **Frontend SliceModal Bundle tier:** new "Slicer bundle" picker at the top of the modal, rendered only when at least one bundle is imported (`GET /slicer/bundles` non-empty). Selecting a bundle replaces cloud / local / standard preset dropdowns with bundle-scoped pickers (process + per-slot filament names from the bundle) — printer is implicit (each `.bbscfg` has exactly one). "None" leaves the modal on the original preset-triplet path. Submit routes through `SliceRequest.bundle` so the backend skips PresetRef resolution and asks the sidecar to materialise the JSON triplet from the stored bundle by name. **Frontend types:** `SliceBundleSpec` + `bundle?: SliceBundleSpec` on `SliceRequest`; `getLibraryFileFilamentRequirements` / `getArchiveFilamentRequirements` accept an optional 4th-arg bundle context object. The orca-slicer-api fork's bundle endpoints (shipped on `bambuddy/bundle-import`) are the server side of this — see the slicer-api sidecar docker-compose for the matching versions.
diff --git a/backend/app/core/config.py b/backend/app/core/config.py
index 48b33cd69..3caf26e43 100644
--- a/backend/app/core/config.py
+++ b/backend/app/core/config.py
@@ -6,7 +6,7 @@ from pathlib import Path
 from pydantic_settings import BaseSettings
 
 # Application version - single source of truth
-APP_VERSION = "0.2.4b3"
+APP_VERSION = "0.2.4b4"
 GITHUB_REPO = "maziggy/bambuddy"
 BUG_REPORT_RELAY_URL = os.environ.get("BUG_REPORT_RELAY_URL", "https://bambuddy.cool/api/bug-report")