diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2291fe946..dbc72c4e0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,13 @@ All notable changes to Bambuddy will be documented in this file.
## [0.1.8b] - Not released
### Enhanced
+- **3D Model Viewer Improvements** (PR #262):
+ - Added plate selector for multi-plate 3MF files with thumbnail previews
+ - Object count display shows number of objects per plate and total
+ - Fullscreen toggle for immersive model viewing
+ - Resizable split view between plate selector and 3D viewer in fullscreen mode
+ - Pagination support for files with many plates (e.g., 50+ plates)
+ - Added i18n translations for all model viewer strings (English, German, Japanese)
- **Virtual Printer Proxy Mode Improvements**:
- SSDP proxy for cross-network setups: select slicer network interface for automatic printer discovery via SSDP relay
- FTP proxy now listens on privileged port 990 (matching Bambu Studio expectations) instead of 9990
diff --git a/backend/app/main.py b/backend/app/main.py
index be0d8db90..5aead77d3 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -2667,8 +2667,8 @@ async def auth_middleware(request, call_next):
# Validate JWT token
import jwt
- try:
+ try:
from backend.app.core.auth import ALGORITHM, SECRET_KEY
token = auth_header.replace("Bearer ", "")
diff --git a/backend/tests/unit/test_plate_object_extraction.py b/backend/tests/unit/test_plate_object_extraction.py
new file mode 100644
index 000000000..692d0e82b
--- /dev/null
+++ b/backend/tests/unit/test_plate_object_extraction.py
@@ -0,0 +1,204 @@
+"""Unit tests for plate object extraction from 3MF model_settings.config."""
+
+from xml.etree import ElementTree as ET
+
+import pytest
+
+
+class TestPlateObjectExtraction:
+ """Tests for extracting object IDs and names from model_settings.config XML."""
+
+ def test_extract_object_names_from_xml(self):
+ """Verify object names are extracted from model_settings.config XML."""
+ xml_content = """
+
+
+
+
+
+ """
+ root = ET.fromstring(xml_content)
+
+ object_names_by_id = {}
+ for obj in root.findall(".//object"):
+ obj_id = obj.get("id")
+ if obj_id:
+ name_meta = obj.find("./metadata[@key='name']")
+ if name_meta is not None:
+ object_names_by_id[obj_id] = name_meta.get("value", f"Object {obj_id}")
+ else:
+ object_names_by_id[obj_id] = f"Object {obj_id}"
+
+ assert object_names_by_id == {
+ "1": "Cube",
+ "2": "Sphere",
+ "3": "Cylinder",
+ }
+
+ def test_extract_object_names_missing_name(self):
+ """Verify objects without names get default names."""
+ xml_content = """
+
+
+
+
+ """
+ root = ET.fromstring(xml_content)
+
+ object_names_by_id = {}
+ for obj in root.findall(".//object"):
+ obj_id = obj.get("id")
+ if obj_id:
+ name_meta = obj.find("./metadata[@key='name']")
+ if name_meta is not None:
+ object_names_by_id[obj_id] = name_meta.get("value", f"Object {obj_id}")
+ else:
+ object_names_by_id[obj_id] = f"Object {obj_id}"
+
+ assert object_names_by_id == {
+ "1": "Named Object",
+ "2": "Object 2",
+ }
+
+ def test_extract_plate_object_associations(self):
+ """Verify plate-to-object associations are extracted correctly."""
+ xml_content = """
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ """
+ root = ET.fromstring(xml_content)
+
+ plate_object_ids = {}
+ for plate in root.findall(".//plate"):
+ plate_id = None
+ for meta in plate.findall("metadata"):
+ if meta.get("key") in ("plater_id", "plate_id"):
+ plate_id = meta.get("value")
+ break
+
+ if plate_id:
+ object_ids = []
+ for instance in plate.findall(".//model_instance"):
+ for meta in instance.findall("metadata"):
+ if meta.get("key") == "object_id":
+ object_ids.append(meta.get("value"))
+ plate_object_ids[plate_id] = object_ids
+
+ assert plate_object_ids == {
+ "1": ["1", "2"],
+ "2": ["3"],
+ }
+
+ def test_extract_plate_object_associations_empty_plate(self):
+ """Verify empty plates have empty object lists."""
+ xml_content = """
+
+
+
+
+
+
+ """
+ root = ET.fromstring(xml_content)
+
+ plate_object_ids = {}
+ for plate in root.findall(".//plate"):
+ plate_id = None
+ for meta in plate.findall("metadata"):
+ if meta.get("key") in ("plater_id", "plate_id"):
+ plate_id = meta.get("value")
+ break
+
+ if plate_id:
+ object_ids = []
+ for instance in plate.findall(".//model_instance"):
+ for meta in instance.findall("metadata"):
+ if meta.get("key") == "object_id":
+ object_ids.append(meta.get("value"))
+ plate_object_ids[plate_id] = object_ids
+
+ assert plate_object_ids == {"1": []}
+
+ def test_object_count_matches_objects_length(self):
+ """Verify object_count equals len(objects)."""
+ objects = ["Cube", "Sphere", "Cylinder"]
+ object_count = len(objects)
+
+ assert object_count == 3
+
+ def test_resolve_object_names_from_ids(self):
+ """Verify object IDs are resolved to names."""
+ object_names_by_id = {
+ "1": "Cube",
+ "2": "Sphere",
+ "3": "Cylinder",
+ }
+ plate_object_ids = ["1", "3"]
+
+ resolved_names = [object_names_by_id.get(obj_id, f"Object {obj_id}") for obj_id in plate_object_ids]
+
+ assert resolved_names == ["Cube", "Cylinder"]
+
+ def test_resolve_object_names_missing_id(self):
+ """Verify missing object IDs get fallback names."""
+ object_names_by_id = {
+ "1": "Cube",
+ }
+ plate_object_ids = ["1", "99"] # 99 doesn't exist
+
+ resolved_names = [object_names_by_id.get(obj_id, f"Object {obj_id}") for obj_id in plate_object_ids]
+
+ assert resolved_names == ["Cube", "Object 99"]
+
+ def test_plate_id_alternatives(self):
+ """Verify both 'plater_id' and 'plate_id' keys are supported."""
+ xml_with_plater_id = """
+
+
+
+
+
+ """
+ xml_with_plate_id = """
+
+
+
+
+
+ """
+
+ def extract_plate_id(xml_content):
+ root = ET.fromstring(xml_content)
+ for plate in root.findall(".//plate"):
+ for meta in plate.findall("metadata"):
+ if meta.get("key") in ("plater_id", "plate_id"):
+ return meta.get("value")
+ return None
+
+ assert extract_plate_id(xml_with_plater_id) == "1"
+ assert extract_plate_id(xml_with_plate_id) == "2"
diff --git a/frontend/src/__tests__/components/ModelViewerModal.test.tsx b/frontend/src/__tests__/components/ModelViewerModal.test.tsx
new file mode 100644
index 000000000..09b0b1da5
--- /dev/null
+++ b/frontend/src/__tests__/components/ModelViewerModal.test.tsx
@@ -0,0 +1,503 @@
+/**
+ * Tests for the ModelViewerModal component.
+ * Tests fullscreen toggle, plate selector, object counts, and tab switching.
+ */
+
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { screen, fireEvent, waitFor } from '@testing-library/react';
+import { render } from '../utils';
+import { ModelViewerModal } from '../../components/ModelViewerModal';
+import { http, HttpResponse } from 'msw';
+import { server } from '../mocks/server';
+
+// Mock ModelViewer and GcodeViewer to avoid WebGL/Three.js issues in tests
+vi.mock('../../components/ModelViewer', () => ({
+ ModelViewer: ({ className }: { className?: string }) => (
+
+ Model Viewer Mock
+
+ ),
+}));
+
+vi.mock('../../components/GcodeViewer', () => ({
+ GcodeViewer: ({ className }: { className?: string }) => (
+
+ G-code Viewer Mock
+
+ ),
+}));
+
+const mockCapabilities = {
+ has_model: true,
+ has_gcode: true,
+ has_source: false,
+ build_volume: { x: 256, y: 256, z: 256 },
+ filament_colors: ['#00ae42'],
+};
+
+const mockPlatesResponse = {
+ is_multi_plate: true,
+ plates: [
+ {
+ index: 1,
+ name: 'Plate 1',
+ has_thumbnail: true,
+ thumbnail_url: '/api/v1/archives/1/plates/1/thumbnail',
+ print_time_seconds: 3600,
+ filament_used_grams: 50.5,
+ object_count: 3,
+ objects: ['Cube', 'Sphere', 'Cylinder'],
+ filaments: [{ color: '#00ae42', type: 'PLA', name: 'Bambu PLA Basic' }],
+ },
+ {
+ index: 2,
+ name: 'Plate 2',
+ has_thumbnail: true,
+ thumbnail_url: '/api/v1/archives/1/plates/2/thumbnail',
+ print_time_seconds: 1800,
+ filament_used_grams: 25.0,
+ object_count: 2,
+ objects: ['Base', 'Cover'],
+ filaments: [{ color: '#ff0000', type: 'PLA', name: 'Red PLA' }],
+ },
+ ],
+};
+
+const mockSinglePlateResponse = {
+ is_multi_plate: false,
+ plates: [
+ {
+ index: 1,
+ name: null,
+ has_thumbnail: false,
+ thumbnail_url: null,
+ print_time_seconds: 7200,
+ filament_used_grams: 100.0,
+ object_count: 5,
+ objects: ['Model 1', 'Model 2', 'Model 3', 'Model 4', 'Model 5'],
+ filaments: [],
+ },
+ ],
+};
+
+describe('ModelViewerModal', () => {
+ const mockOnClose = vi.fn();
+
+ beforeEach(() => {
+ vi.clearAllMocks();
+ server.use(
+ http.get('/api/v1/archives/:id/capabilities', () => {
+ return HttpResponse.json(mockCapabilities);
+ }),
+ http.get('/api/v1/archives/:id/plates', () => {
+ return HttpResponse.json(mockPlatesResponse);
+ })
+ );
+ });
+
+ describe('rendering', () => {
+ it('renders the modal with title', async () => {
+ render(
+
+ );
+
+ expect(screen.getByText('Test Model.3mf')).toBeInTheDocument();
+ });
+
+ it('renders Open in Slicer button', async () => {
+ render(
+
+ );
+
+ await waitFor(() => {
+ expect(screen.getByText('Open in Slicer')).toBeInTheDocument();
+ });
+ });
+
+ it('shows loading spinner while fetching capabilities', () => {
+ server.use(
+ http.get('/api/v1/archives/:id/capabilities', async () => {
+ await new Promise((r) => setTimeout(r, 100));
+ return HttpResponse.json(mockCapabilities);
+ })
+ );
+
+ render(
+
+ );
+
+ const loader = document.querySelector('.animate-spin');
+ expect(loader).toBeInTheDocument();
+ });
+ });
+
+ describe('tabs', () => {
+ it('renders 3D Model and G-code tabs', async () => {
+ render(
+
+ );
+
+ await waitFor(() => {
+ expect(screen.getByText('3D Model')).toBeInTheDocument();
+ expect(screen.getByText('G-code Preview')).toBeInTheDocument();
+ });
+ });
+
+ it('shows not available label when model is not available', async () => {
+ server.use(
+ http.get('/api/v1/archives/:id/capabilities', () => {
+ return HttpResponse.json({
+ ...mockCapabilities,
+ has_model: false,
+ });
+ })
+ );
+
+ render(
+
+ );
+
+ await waitFor(() => {
+ expect(screen.getByText('(not available)')).toBeInTheDocument();
+ });
+ });
+
+ it('shows not sliced label when gcode is not available', async () => {
+ server.use(
+ http.get('/api/v1/archives/:id/capabilities', () => {
+ return HttpResponse.json({
+ ...mockCapabilities,
+ has_gcode: false,
+ });
+ })
+ );
+
+ render(
+
+ );
+
+ await waitFor(() => {
+ expect(screen.getByText('(not sliced)')).toBeInTheDocument();
+ });
+ });
+
+ it('disables tab when capability is not available', async () => {
+ server.use(
+ http.get('/api/v1/archives/:id/capabilities', () => {
+ return HttpResponse.json({
+ ...mockCapabilities,
+ has_gcode: false,
+ });
+ })
+ );
+
+ render(
+
+ );
+
+ await waitFor(() => {
+ const gcodeTab = screen.getByText('G-code Preview').closest('button');
+ expect(gcodeTab).toBeDisabled();
+ });
+ });
+ });
+
+ describe('fullscreen', () => {
+ it('renders fullscreen toggle button', async () => {
+ render(
+
+ );
+
+ await waitFor(() => {
+ // Look for the maximize icon button
+ const buttons = screen.getAllByRole('button');
+ const fullscreenButton = buttons.find(
+ (btn) => btn.querySelector('.lucide-maximize-2') || btn.title === 'Enter fullscreen'
+ );
+ expect(fullscreenButton).toBeInTheDocument();
+ });
+ });
+ });
+
+ describe('object count', () => {
+ it('displays object count for multi-plate files', async () => {
+ render(
+
+ );
+
+ await waitFor(() => {
+ // Total objects across both plates = 3 + 2 = 5
+ // The header shows "All Plates: 5 objects" in a span
+ const objectCountBadge = screen.getByText(/All Plates.*5 objects/);
+ expect(objectCountBadge).toBeInTheDocument();
+ });
+ });
+
+ it('updates object count when plate is selected', async () => {
+ render(
+
+ );
+
+ await waitFor(() => {
+ expect(screen.getByText('Plate 1')).toBeInTheDocument();
+ });
+
+ // Click on Plate 1
+ fireEvent.click(screen.getByText('Plate 1'));
+
+ await waitFor(() => {
+ // Plate 1 has 3 objects - header should update to show "Plate 1: 3 objects"
+ const objectCountBadge = screen.getByText(/Plate 1.*3 objects/);
+ expect(objectCountBadge).toBeInTheDocument();
+ });
+ });
+ });
+
+ describe('plate selector', () => {
+ it('shows plates panel for multi-plate files', async () => {
+ render(
+
+ );
+
+ await waitFor(() => {
+ expect(screen.getByText('Plates')).toBeInTheDocument();
+ // Use getAllByText for "All Plates" since it appears in header and panel
+ const allPlatesElements = screen.getAllByText('All Plates');
+ expect(allPlatesElements.length).toBeGreaterThan(0);
+ expect(screen.getByText('2 plates')).toBeInTheDocument();
+ });
+ });
+
+ it('shows individual plate buttons', async () => {
+ render(
+
+ );
+
+ await waitFor(() => {
+ expect(screen.getByText('Plate 1')).toBeInTheDocument();
+ expect(screen.getByText('Plate 2')).toBeInTheDocument();
+ });
+ });
+
+ it('shows object count for each plate', async () => {
+ render(
+
+ );
+
+ await waitFor(() => {
+ // Each plate shows its object count in the grid
+ expect(screen.getByText('3 objects')).toBeInTheDocument();
+ expect(screen.getByText('2 objects')).toBeInTheDocument();
+ });
+ });
+
+ it('hides plates panel for single-plate files', async () => {
+ server.use(
+ http.get('/api/v1/archives/:id/plates', () => {
+ return HttpResponse.json(mockSinglePlateResponse);
+ })
+ );
+
+ render(
+
+ );
+
+ await waitFor(() => {
+ // Should show object count but not plate selector
+ expect(screen.getByText(/5 objects/)).toBeInTheDocument();
+ });
+
+ // Plates panel should not be shown for single plate
+ expect(screen.queryByText('2 plates')).not.toBeInTheDocument();
+ });
+
+ it('selects All Plates by default', async () => {
+ render(
+
+ );
+
+ await waitFor(() => {
+ // Find the All Plates button in the grid (the one with "2 plates" sibling text)
+ const platesCountText = screen.getByText('2 plates');
+ const allPlatesButton = platesCountText.closest('button');
+ // The selected button should have the green border class
+ expect(allPlatesButton).toHaveClass('border-bambu-green');
+ });
+ });
+
+ it('allows plate selection via click', async () => {
+ render(
+
+ );
+
+ await waitFor(() => {
+ expect(screen.getByText('Plate 1')).toBeInTheDocument();
+ });
+
+ // Click on Plate 1 - this should not throw
+ const plate1Button = screen.getByText('Plate 1').closest('button');
+ expect(plate1Button).toBeInTheDocument();
+ fireEvent.click(plate1Button!);
+
+ // After clicking, the header should show Plate 1 info
+ await waitFor(() => {
+ expect(screen.getByText(/Plate 1.*3 objects/)).toBeInTheDocument();
+ });
+ });
+ });
+
+ describe('close behavior', () => {
+ it('calls onClose when X button is clicked', async () => {
+ render(
+
+ );
+
+ const closeButton = screen.getAllByRole('button').find(
+ (btn) => btn.querySelector('.lucide-x')
+ );
+
+ if (closeButton) {
+ fireEvent.click(closeButton);
+ expect(mockOnClose).toHaveBeenCalled();
+ }
+ });
+
+ it('calls onClose when Escape key is pressed', () => {
+ render(
+
+ );
+
+ fireEvent.keyDown(window, { key: 'Escape' });
+ expect(mockOnClose).toHaveBeenCalled();
+ });
+
+ it('calls onClose when backdrop is clicked', () => {
+ render(
+
+ );
+
+ const backdrop = document.querySelector('.fixed.inset-0');
+ if (backdrop) {
+ fireEvent.click(backdrop);
+ expect(mockOnClose).toHaveBeenCalled();
+ }
+ });
+ });
+
+ describe('library file mode', () => {
+ it('renders for library file', async () => {
+ server.use(
+ http.get('/api/v1/library/files/:id/plates', () => {
+ return HttpResponse.json(mockSinglePlateResponse);
+ })
+ );
+
+ render(
+
+ );
+
+ expect(screen.getByText('Library Model.3mf')).toBeInTheDocument();
+
+ await waitFor(() => {
+ expect(screen.getByText('3D Model')).toBeInTheDocument();
+ });
+ });
+
+ it('disables Open in Slicer for non-3mf library files', async () => {
+ render(
+
+ );
+
+ await waitFor(() => {
+ const slicerButton = screen.getByText('Open in Slicer').closest('button');
+ expect(slicerButton).toBeDisabled();
+ });
+ });
+ });
+});
diff --git a/test_backend.sh b/test_backend.sh
index 38e0c415b..a5a43970e 100755
--- a/test_backend.sh
+++ b/test_backend.sh
@@ -1,5 +1,6 @@
#!/bin/sh
cd backend
+ruff check && ruff format --check
../venv/bin/python3 -m pytest tests/ -v -n 14
cd ..