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Extrudex/design/homepage-spec.md
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Extrudex — Homepage (Main Hub) UI/UX Specification

Author: Sketch (Design Lead)
Date: April 20, 2026
Version: 1.0
Status: Ready for Review → Implementation Handoff

1. Objective

Who is it for?
Workshop operators and print managers who interact with Extrudex primarily on a Raspberry Pi 5 kiosk touchscreen (arm's length, greasy hands, ambient workshop lighting) and secondarily via a mobile PWA browser for remote monitoring.

What task are they completing?
The Homepage serves as the command center — the single screen where a user can, at a glance:

  1. Assess the fleet — See the real-time status of every printer (printing, idle, paused, error, offline).
  2. Spot problems fast — Instantly identify which machines need attention (errors, paused jobs, low filament).
  3. Take action — Navigate to a specific printer, spool, or print job with minimal taps.
  4. Monitor inventory — Get a quick read on filament stock levels and recent consumption.
  5. Recent activity — See the last few completed or failed prints for situational awareness.

Success metric: A user walking past the kiosk can determine fleet health in under 2 seconds without touching the screen.

2. Screen Inventory

The Homepage/Main Hub is a single screen that serves as the root of the navigation tree. It does not itself contain sub-screens, but it is the gateway to:

Destination Screen Triggered By Priority
Printer Detail Tapping any printer card Primary
Spool Inventory Nav tab "Spools" Primary
Print Jobs Nav tab "Prints" Primary
Materials DB Nav tab "Materials" Secondary
Settings Nav tab "Settings" Secondary
Quick Scan Floating action button (FAB) Primary

The Homepage itself contains these in-page sections (not separate screens):

  1. Status Summary Bar — Fleet-wide health at a glance
  2. Printer Fleet Grid — Live status cards for each printer
  3. Filament Stock Snapshot — Inventory overview with low-stock alerts
  4. Recent Activity Feed — Last 5 print events

3. Layout Specification

Page Title

"Extrudex" — Always visible in the top app bar. No subtitle needed; this is the root screen.

Navigation Structure

Primary Navigation: Bottom Navigation Bar (Mobile/Kiosk)
Material Design 3 bottom navigation with 5 destinations:

Tab Icon (Material Symbols) Label Badge?
Hub dashboard Hub — (active by default)
Printers print Printers Error count badge
Spools inventory_2 Spools Low-stock badge
Prints receipt_long Prints —
Settings settings Settings —

Rationale for bottom nav:

  • Touch-first: bottom nav is the easiest reach zone on a touchscreen kiosk or phone.
  • 5 tabs is the MD3 maximum — keeps things scannable.
  • "Hub" is the homepage; the other four are top-level destinations.
  • Badges on Printers/Spools draw attention to problems without requiring navigation.

Desktop/Navigation Rail (Future)
On wider screens (browser dashboard), the bottom nav converts to a Material 3 Navigation Rail on the left edge with the same 5 destinations. This is a responsive transformation, not a separate navigation system.

Main Sections (Top to Bottom)

A. Top App Bar

  • Leading: Extrudex logo mark (gear icon + "EXTRUDEX" in Inter Bold)
  • Trailing:
    • Connection status indicator (green dot = SignalR connected, red dot = disconnected)
    • Clock (kiosk mode — always visible so users know the time without looking at their phone)
  • Style: MD3 medium top app bar, surface color background, no elevation (flat)
  • Height: 64px kiosk / 56px mobile

B. Status Summary Bar

A horizontal strip below the app bar showing fleet-wide metrics in a single row:

Metric Format Color Logic
Printers Active 4 / 7 Text only, neutral
Printers in Error 1 Red if > 0, hidden if 0
Low Filament Spools 2 Yellow if > 0, hidden if 0
Prints Today 12 Neutral
  • Layout: Horizontal flex row, evenly spaced, each metric in a compact chip/badge
  • Kiosk override: Larger font (20px), more spacing between metrics
  • Mobile: Compact chips with icons, horizontally scrollable if overflow
  • Tap behavior: Tapping "Printers in Error" navigates to Printers tab filtered to errors. Tapping "Low Filament" navigates to Spools tab filtered to low stock.

C. Printer Fleet Grid

The heart of the homepage. A responsive grid of printer status cards.

Card Layout (each printer):

┌─────────────────────────────┐
│  [Status Dot]  Printer Name  │  ← Header row
│─────────────────────────────│
│  Current Job: Benchy #3     │  ← Job name or "Idle"
│  [████████░░] 72%           │  ← Progress bar + percentage
│  Filament: PLA Silk         │  ← Active material
│  Remaining: ~142g           │  ← Spool remaining
│  ETA: 0h 23m               │  ← Time remaining
│─────────────────────────────│
│  [View Detail →]            │  ← Tap target / CTA
└─────────────────────────────┘

Status Dot Colors:

  • 🟢 Green (#4ADE70 kiosk / #16A34A light) — Printing / Active
  • 🟡 Yellow (#FACC15 kiosk / #CA8A04 light) — Paused
  • 🔴 Red (#F87171 kiosk / #DC2626 light) — Error / Failed
  • ⚪ Gray (#64748B) — Idle / Offline

Grid Behavior:

  • Kiosk (800×480 Pi 5): 2 columns, 3–4 rows (scrollable)
  • Tablet (768px+): 3 columns
  • Mobile (< 480px): 1 column, list view

Card Dimensions:

  • Kiosk: Full-width within column, min-height 180px
  • Mobile: Full-width, min-height 140px, slightly denser

Important States:

  • Printing (active): Progress bar animates, card has subtle left-border accent in green
  • Paused: Yellow left border, progress bar frozen, "PAUSED" badge overlaid
  • Error: Red left border, card background shifts to error-container token, error message shown
  • Idle: Gray left border, dimmed progress area, "Ready" label
  • Offline: Fully dimmed card, "OFFLINE" badge, no real-time data

D. Filament Stock Snapshot

A compact section showing inventory health:

Layout: Horizontal scrolling row of small cards or a mini-list

┌──────────────────┐ ┌──────────────────┐ ┌──────────────────┐
│  PLA             │ │  PETG            │ │  TPU             │
│  ████████░░ 80%  │ │  ████░░░░░ 40%  │ │  ██░░░░░░░ 20%   │
│  23 spools       │ │  8 spools        │ │  3 spools ⚠️     │
└──────────────────┘ └──────────────────┘ └──────────────────┘
  • Each card shows: Material base name, stock percentage bar, spool count
  • Cards with < 25% stock get a ⚠️ warning indicator and yellow-tinted background
  • Kiosk: 2–3 cards visible, swipe to see more
  • Mobile: Horizontal scroll carousel
  • Tap: Navigates to Spools tab filtered by that material

E. Recent Activity Feed

The last 5 print events in a compact list:

┌────────────────────────────────────────────────────┐
│ ✓  Benchy #3      · PLA Silk    · 23g   · 0h45m    │
│ ✓  Gear Set v2    · PETG Basic  · 87g   · 2h12m    │
│ ✗  Phone Case     · TPU Basic   · —      · Failed   │
│ ✓  Calibration    · PLA Basic   · 4g    · 0h05m    │
│ ✓  Bracket x4     · ASA Matte   · 156g  · 4h30m    │
└────────────────────────────────────────────────────┘
  • Each row: Status icon, job name, material, weight used, duration
  • Failed prints show ✗ in red with "Failed" label
  • Kiosk: Larger text, comfortable row height (56px)
  • Mobile: Standard list density (48px rows)
  • Tap a row: Navigates to that print's detail view
  • "View All" link: At bottom, navigates to Prints tab

Primary CTA

Floating Action Button (FAB): "Quick Scan" — a prominent FAB in the bottom-right corner with a qr_code_scanner icon. This triggers the barcode/USB scanner workflow for spool check-in/check-out.

  • Kiosk: Extended FAB with label "Scan" + icon, 56×56px minimum
  • Mobile: Standard FAB, icon only, 56×56px
  • Positioned above the bottom nav, with 16px margin from edges

Secondary Actions

  • Tap any printer card → Printer Detail
  • Tap any stock card → Spools filtered
  • Tap any activity row → Print detail
  • Tap error/low badges in summary bar → Filtered navigation

Key Components (MD3)

Component Usage Notes
Bottom Navigation Primary nav 5 destinations
Top App Bar (Medium) App header Logo + status + clock
Cards (Elevated) Printer status Real-time content
Cards (Filled/outlined) Filament stock Compact, scrollable
List Activity feed 3-line items
FAB (Extended/Regular) Quick Scan Always accessible
Badge Nav tabs, status Error count, low stock
Linear Progress Indicator Print progress On printer cards
Chip Status summary Compact metrics

Important States

State Visual Treatment
Loading (initial) Skeleton screens for printer cards, shimmer animation
SignalR disconnected Red dot in app bar, banner: "Live updates paused — reconnecting..."
No printers registered Empty state illustration + "Add your first printer" CTA
No spools registered Stock section shows "No inventory — add spools to start tracking"
All printers idle Fleet grid shows all gray cards, summary bar shows "0 active"
Critical error (printer) Card pulses red border once, then steady red left border

4. UX Rationale

Why This Layout Supports the Task

  1. Fleet health at a glance: The Status Summary Bar + Printer Fleet Grid are visible immediately on load. No scrolling required on kiosk to see if something is wrong. Color-coded status dots and left-border accents make the visual scan instantaneous.

  2. Progressive detail: The homepage gives you "enough" — status, progress, material. You only tap into a printer card when you need details (temps, G-code, history). This avoids information overload while keeping critical data surface-level.

  3. Inventory awareness without navigation: The Filament Stock Snapshot means operators don't need to leave the homepage to know if they're running low. The warning state (yellow + ⚠️) is visible without interpreting numbers.

  4. Activity context: The Recent Activity Feed gives "what just happened" situational awareness — useful when returning to the kiosk after being away. It answers "did that print finish?" without requiring navigation.

  5. Scan-first workflow: The FAB for Quick Scan is always accessible from the homepage, which is the most common action for spool check-in during workshop operations. Placed bottom-right — the natural resting thumb zone.

Hierarchy (What matters most → least)

  1. Printer errors (red, draws the eye immediately)
  2. Active printers with progress (green accent, animated progress bars)
  3. Paused printers (yellow accent, needs attention)
  4. Low filament warnings (yellow indicators in stock section)
  5. Idle printers (gray, calm, no action needed)
  6. Recent activity (informational, below the fold on mobile)

Tradeoffs

Decision Benefit Cost Mitigation
Bottom nav over side nav Touch-friendly, MD3 standard, always visible Takes screen space at bottom Acceptable on touch-first device
Cards over table Glanceable, status-colorable, touch-friendly Less dense (can't see 7 printers at once) Grid layout maximizes visible count; scroll for 6+ printers
Summary bar metrics Fleet health without scrolling Adds cognitive load if too many metrics Keep to 4 max, hide zero-value metrics
Horizontal scroll for stock cards Saves vertical space, works well for 3–6 materials Hidden cards require swipe First 3 most-used materials visible; swipe for rest
FAB for scan Always accessible, one-tap Covers content behind it Standard FAB behavior; scrolls away on mobile
No sidebar on kiosk Maximizes kiosk screen real estate No persistent deep-nav Bottom nav is sufficient for 5 top-level destinations

5. Visual Direction

Tone

Modern Industrial/Maker — Dark mode by default on kiosk. Professional workshop vibe. High contrast. Think: a CNC control panel, not a social media app. The aesthetic should feel like a tool you trust, not an app you browse.

Dark Mode Palette (Kiosk Default)

Token Value Usage
md.sys.color.background #0F172A Page background
md.sys.color.surface #1E293B Card backgrounds, nav bar
md.sys.color.surface-container #334155 Elevated cards, containers
md.sys.color.surface-container-high #475569 Hover/pressed states
md.sys.color.primary #60A5FA Primary actions, links, active tab
md.sys.color.on-primary #0F172A Text on primary
md.sys.color.primary-container #1E3A5F Subtle primary tinted containers
md.sys.color.error #F87171 Error states, failed prints
md.sys.color.error-container #450A0A Error card backgrounds
md.sys.color.on-error #FFFFFF Text on error
md.sys.color.on-surface #F1F5F9 Primary text
md.sys.color.on-surface-variant #94A3B8 Secondary text
md.sys.color.outline #334155 Borders, dividers
md.sys.color.outline-variant #1E293B Subtle borders

Light Mode Palette (Dashboard/Future)

Token Value Usage
md.sys.color.background #F8FAFC Page background
md.sys.color.surface #FFFFFF Card backgrounds
md.sys.color.primary #2563EB Primary actions
md.sys.color.on-surface #0F172A Primary text
md.sys.color.on-surface-variant #475569 Secondary text

Typography

Role Font Weight Size (Kiosk) Size (Mobile)
App Title Inter Bold 22px 20px
Card Title (Printer Name) Inter SemiBold 20px 18px
Section Heading Inter SemiBold 18px 16px
Body Text Inter Regular 18px 16px
Metric Value Inter Bold 28px 24px
Metric Label Inter Medium 14px 12px
Mono Values (weight, time, %) JetBrains Mono Medium 18px 16px
Caption / Timestamp Inter Regular 14px 12px

Rationale for oversized metrics: The kiosk is viewed at arm's length or further. A 28px bold metric is legible from 3–4 feet away. Monospace for numeric values ensures columns align and feels "instrument-like."

Spacing / Density

Token Kiosk Mobile
Page padding 24px 16px
Card padding 20px 16px
Grid gap 16px 12px
Section gap 32px 24px
Row height (lists) 56px 48px
FAB margin from edge 16px 16px
Touch target minimum 48px 44px

Component Behavior

  • Printer cards: Update in real-time via SignalR. Progress bar animates smoothly (CSS transition 300ms). Status changes trigger a brief highlight flash (200ms background shift) to draw attention.
  • Bottom nav: Active tab has primary color icon + label. Inactive tabs use on-surface-variant. Badges are small circles positioned at the icon's top-right.
  • FAB: Elevated with shadow-3. On tap, ripple effect. Extended label appears on kiosk (wider screen), icon-only on mobile.
  • Status summary bar: Metric chips are non-scrolling on kiosk (fits in one row at 800px width), horizontally scrolling on mobile if needed.
  • Activity feed: List items have subtle divider lines (outline-variant). Failed items have error-container background tint.
  • Skeleton loading: Cards show shimmer placeholder during initial load (1.5s max before content appears).

Color Usage Guidelines

  1. Color is information, not decoration. Every colored element must communicate state.
  2. Red = immediate attention. Only use for errors, failures, disconnections. Never for decoration.
  3. Yellow = needs attention soon. Paused printers, low filament, warnings.
  4. Green = operating normally. Active printing, completed, connected.
  5. Blue = interactive. Links, buttons, active navigation, primary CTAs.
  6. Gray = neutral/idle. Offline printers, inactive states, secondary info.
  7. Never use color alone to convey meaning. Always pair with icon + text label (accessibility).

6. Responsiveness

Breakpoints

Breakpoint Width Layout
Kiosk 480–800px (Pi 5 typical: 800×480) 2-col grid, bottom nav, extended FAB
Mobile (compact) < 480px 1-col list, bottom nav, standard FAB
Tablet 768–1024px 3-col grid, bottom nav, extended FAB
Desktop 1024px+ 3-col grid, nav rail, extended FAB

Layout Changes by Device

Pi 5 Kiosk (800×480, Landscape)

  • Top app bar: 64px height, clock always visible
  • Status summary: 4 metrics in a single row (fits 800px)
  • Printer grid: 2 columns × N rows, scrollable vertically
  • Stock snapshot: 3 cards visible, no scroll needed (most common materials first)
  • Activity feed: 3 rows visible, "View All" link
  • Bottom nav: Full 5 tabs
  • FAB: Extended with "Scan" label

Mobile PWA (< 480px, Portrait)

  • Top app bar: 56px height, no clock (use phone clock)
  • Status summary: 2–3 metrics visible, horizontal scroll for more
  • Printer grid: 1 column list view (cards become horizontal list items)
  • Stock snapshot: Horizontal carousel, 2 cards visible
  • Activity feed: 3–5 rows, compact density
  • Bottom nav: 5 tabs (may collapse labels on very narrow screens)
  • FAB: Icon only, standard 56px

Tablet / Desktop Browser

  • Bottom nav → Navigation Rail (left side, 80px wide)
  • Printer grid: 3 columns
  • Stock snapshot: 4–5 cards visible in row
  • Activity feed: 5 rows
  • Additional whitespace — dashboard mode can breathe more

Kiosk-Specific Considerations

  • No hover states — all interactions are tap/click only
  • No tooltips — information must be visible inline
  • Larger touch targets — 48px minimum (4px above MD3 default)
  • No right-click context menus — all actions are explicit buttons/links
  • Screen wake — kiosk should not sleep; CSS animation on a subtle element to prevent screen burn-in (shift a 1px element every 60s)
  • Overshoot scroll — prevent pull-to-refresh or browser gestures (PWA overscroll-behavior: none)

7. Developer Handoff Notes

Reusable Components to Build

Component Type Props/Inputs Notes
<ex-printer-card> Standalone printer: Printer, status: PrinterStatus, job?: PrintJob Left-border color computed from status. SignalR drives re-renders.
<ex-status-dot> Atom status: 'active' | 'paused' | 'error' | 'idle' | 'offline' Small colored circle (12px) with aria-label for accessibility
<ex-metric-chip> Atom label: string, value: string | number, variant: 'default' | 'error' | 'warning' Used in Status Summary Bar
<ex-stock-card> Standalone material: string, percentage: number, spoolCount: number, lowStock: boolean Horizontal scroll child
<ex-activity-item> List Item job: PrintEvent 3-line list item with status icon
<ex-progress-bar> Atom value: number, status: PrinterStatus MD3 linear progress, color matches status
<ex-fleet-summary> Composite printers: Printer[], spools: Spool[] Renders metric chips row
<ex-connection-indicator> Atom connected: boolean Green/red dot in app bar

Angular Material Components Used

  • MatBottomNavigation (or custom bottom nav — MD3 bottom nav is not yet in Angular Material; implement with MatTabNav + custom styling)
  • MatCard → Styled with custom dark tokens
  • MatProgressBar → Custom color per status
  • MatFabButton / MatMiniFabButton
  • MatBadge → For nav tab badges
  • MatList → Activity feed
  • MatChip → Status summary metrics
  • MatIcon → Material Symbols throughout
  • MatToolbar → Top app bar

Interaction Notes

  1. SignalR subscriptions: The homepage must subscribe to PrinterHub on mount. Each printer card re-renders on status/progress push events. Unsubscribe on navigate-away.
  2. Optimistic updates: Progress bars should animate smoothly — use CSS transitions, not discrete jumps. If SignalR sends a progress update every 5s, interpolate between values.
  3. FAB scan action: On tap, immediately focus a hidden text input that captures USB HID barcode scanner output ( scanners type characters + Enter). This is a capture-only input — no keyboard should appear on mobile. Use <input readonly> or intercept keydown globally.
  4. Pull-to-refresh: Disabled on kiosk. On mobile PWA, consider enabling for manual data refresh.
  5. Navigation: Use Angular Router with bottom nav tabs bound to routerLinkActive. Highlight active tab. Preserve scroll position when returning to Hub.
  6. Skeleton screens: On initial load, show 6 skeleton printer cards (matching grid layout). Use @angular/material skeleton patterns or custom shimmer CSS.

Accessibility

Requirement Implementation
Screen reader All status indicators have aria-label (e.g., "Printer Elegoo-1: Printing, 72% complete")
Color blindness Never color-only — always icon + text + color. Status dots have aria-labels
Keyboard nav Tab order: top bar → summary metrics → printer cards (grid order) → stock → activity → FAB → bottom nav
Focus management After navigation, focus lands on the page title. After FAB tap, focus returns to FAB
Touch target 48px minimum on kiosk, 44px minimum on mobile — all interactive elements
Contrast All text on dark background meets WCAG AA (4.5:1 for body, 3:1 for large text)
Motion Respect prefers-reduced-motion — disable progress bar animation and shimmer if set
Live regions Printer status changes announced via aria-live="polite" on the card region

Performance Notes

  • OnPush change detection for all components receiving SignalR data
  • TrackBy on printer grid *ngFor to avoid re-rendering unchanged cards
  • Virtual scrolling for activity feed if it grows beyond 20 items (use @angular/cdk ScrollingModule)
  • Lazy load Spools, Prints, Materials, Settings tabs — only Hub is eager-loaded
  • Image optimization: Use inline SVG for status icons, not raster images. Logo should be SVG.

File Structure Suggestion

src/app/
├── pages/
│   └── hub/
│       ├── hub.component.ts
│       ├── hub.component.html
│       ├── hub.component.scss
│       └── hub.component.spec.ts
├── components/
│   ├── printer-card/
│   ├── status-dot/
│   ├── metric-chip/
│   ├── stock-card/
│   ├── activity-item/
│   ├── progress-bar/
│   ├── fleet-summary/
│   └── connection-indicator/
├── layout/
│   ├── bottom-nav/
│   ├── top-app-bar/
│   └── nav-rail/
└── shared/
    └── tokens/
        └── _extrudex-tokens.scss

Appendix: Navigation Map

┌──────────────────────────────────────────────────────────────┐
│                        EXTRUDEX                              │
│                                                              │
│  ┌─ Hub (Home) ──────────────────────────────────────────┐   │
│  │  • Fleet Status Grid                                   │   │
│  │  • Filament Snapshot                                    │   │
│  │  • Recent Activity                                      │   │
│  │  • [FAB: Quick Scan]                                   │   │
│  └────────────────────────────────────────────────────────┘   │
│                                                              │
│  ┌─ Printers ────────┐  ┌─ Spools ─────────────────────┐     │
│  │  Printer List      │  │  Spool Inventory             │     │
│  │  → Printer Detail  │  │  → Spool Detail              │     │
│  │    → Job History   │  │  → Check-in/Check-out        │     │
│  │    → Controls      │  │  → Link to Printer           │     │
│  └────────────────────┘  └─────────────────────────────┘     │
│                                                              │
│  ┌─ Prints ──────────┐  ┌─ Settings ───────────────────┐    │
│  │  Print Job List    │  │  System Configuration          │    │
│  │  → Print Detail   │  │  Printer Management           │    │
│  │  → COGS Report    │  │  User Preferences              │    │
│  └────────────────────┘  └──────────────────────────────┘    │
│                                                              │
│  ══════════════════════════════════════════════════════════   │
│  [Hub]  [Printers]  [Spools]  [Prints]  [Settings]           │
│  ══════════════════════════════════════════════════════════   │
└──────────────────────────────────────────────────────────────┘

End of Specification — Ready for Stuart (mockup generation) and Rex (implementation handoff)

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