PrintSpy

A self-hosted dashboard for monitoring multiple 3D printers — OctoPrint and PrusaLink — from a single web interface.

This was built for my own personal use and the way I want to interact with my printers, as well as an ongoing experiment in agentic coding.

Early Development — expect rough edges, breaking changes, and evolving APIs. Feedback and contributions welcome.

What it does

Each printer gets a row in the dashboard: webcam/snapshot, progress/ETA, temps, and smart plug power state/control. Updates push live via SSE. Everything's configured through the settings page — no config files, no restart needed.

Screenshots

Supported platforms

• OctoPrint — fully supported (as far as I know)
• PrusaLink — more than experimental at this point, but only tested on MK4S and Core One

Plugin architecture — new platforms should be straightforward to add.

Features

Core (both platforms)

• Real-time dashboard updates via SSE, no manual refresh
• Print control — pause, resume, cancel
• File Manager per printer — browse every file on its storage, one-click reprint, download, or delete, thumbnail and material/tool previews for every file (native on OctoPrint, cached from the file's own metadata on PrusaLink)
• Print history per printer, with configurable retention (days, 0 = keep forever) and real thumbnails per entry
• Pushover notifications — print started/checkpoints/complete/failed/error, each independently configurable: priority, sound, image source (camera/thumbnail/none), and custom title/message templates
• Smart plug power control via a directly-configured Tasmota device, independent of any platform plugin, assignable to any printer — HTTP-direct (default) or MQTT (push-based, opt-in per plug)
• Auto-off after idle timeout and thermal runaway protection (second layer on top of firmware protection) for printers with an assigned smart plug
• Camera feed via printspy-cam (ESP32-CAM firmware), assignable to any printer — snapshot/live/plate-thumbnail toggle buttons under each card's image, with an optional global setting to hide the whole section for a printer while it's unreachable
• Multi-user login with per-account passwords, no roles/tiers
• Config backup/restore as YAML
• Printer reordering, optional free-text "model" field, dark mode, responsive layout

OctoPrint

• Auto-detects camera stack (MJPEG or camera-streamer), printer name, and installed plugins
• Native smart plug power control + energy monitoring, auto-detected via the Tasmota or PSU Control plugin
• Layer progress display (needs the DisplayLayerProgress plugin)
• Live webcam streaming, with a snapshot/live toggle

PrusaLink

• Snapshot only — no live stream from the printer's own camera (assign a printspy-cam for a live feed)
• No native power control over the API — use a directly-configured smart plug instead
• Keepalive ping — works around printers whose wifi drops off after sitting idle
• File upload from the dashboard, with an optional "print immediately"
• Slicer print-host target — point PrusaSlicer/OrcaSlicer's "Send to printer" (PrusaLink mode) at PrintSpy, pinned to one specific printer; "Upload" relays automatically once the printer's online, "Upload and Print" also powers it on first if it's off — no manual step either way
• Print history enriched with real per-print metadata — material, filament used/cost, layer height, duration vs. estimate, and per-tool breakdown for multi-material prints — parsed directly from the file's own slicer metadata, since none of this is exposed over PrusaLink's API

Quick start

docker run -d \
  --name printspy \
  -p 8080:8080 \
  -v printspy-data:/data \
  ccmpbll/printspy:latest

Open http://<docker host IP>:8080 — first run prompts you to create a login. Once in, click the settings gear and add your first printer. You'll need the printer's URL and OctoPrint API key or Prusalink user/pass.

Docker Compose

services:
  printspy:
    image: ccmpbll/printspy:latest
    ports:
      - "8080:8080"
    volumes:
      - printspy-data:/data
    restart: unless-stopped

volumes:
  printspy-data:

Configuration

All printer management is done through the web UI — open the settings page to add, edit, reorder, and remove printers. No config files needed.

Login

First run redirects to a setup page to create the first account. Add or remove additional users from Settings → Users. No roles or permission tiers — every account has full access.

Smart plugs

OctoPrint printers with the Tasmota or PSU Control plugin installed get power control automatically — nothing to configure. For everything else (PrusaLink or an OctoPrint printer without the plugin), add a Tasmota device directly under Settings → Smart Plugs and assign it to a printer. Plugs are managed independently of printers, so deleting a printer unassigns its plug instead of deleting it.

Each plug can use either connection mode:

• Direct HTTP (default) — polled over the network on each printer's own poll interval, no extra setup
• MQTT — push-based via a broker instead of polling; configure the broker under Settings → MQTT Broker (host:port, optional TLS/username/password), then set the plug's mode to MQTT and enter its Tasmota topic

Both modes can be mixed freely across plugs.

Cameras

Any printer type can get a webcam feed by assigning a printspy-cam device under Settings → Cameras — useful for PrusaLink, which has no webcam support of its own. Assigning a camera overrides whatever webcam a printer's own plugin would otherwise show. Cameras are managed independently of printers, so deleting a printer unassigns its camera instead of deleting it.

Environment variables

Getting your OctoPrint API key

1. Open your OctoPrint web interface
2. Go to Settings (wrench icon) → API
3. Copy the Global API Key, or create a new one under Application Keys

Tech stack

• Go backend — single binary, low resource usage
• SQLite — no external database needed
• Vanilla HTML/CSS/JS frontend — no build step, no framework
• Docker — amd64 container

Building from source

# Requires Go 1.25+ and CGO (for SQLite)
make build

# Or with Docker
make docker

Contributing

PrintSpy is in early development. If you'd like to contribute:

• Open an issue to discuss before submitting large changes
• Bug reports with docker logs output are especially helpful
• Plugin implementations for Moonraker/Klipper are welcome

License

AGPL-3.0 — see LICENSE for details.