printer_send_gcode

THE RISK

High Risk

Why printer_send_gcode needs a policy

G-code execution on a 3D printer is an Execute-category action. An AI agent misusing this tool could send dangerous commands (e.g., set unsafe temperatures, move axes into hard stops, disable thermal runaway protection via M codes), potentially damaging the printer or causing fire/safety hazards. This warrants high severity given the physical-world blast radius.

From the tool's definition "Send a single G-code command to the printer" — G-code commands can control all aspects of printer hardware including motion, temperature, fans, and extrusion.

Documented attack patterns abuse exactly the kind of access printer_send_gcode gives an agent:

POLICY

How to control printer_send_gcode

PolicyLayer is an MCP gateway — it sits between your AI agents and Bambu Lab MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for printer_send_gcode:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "printer_send_gcode": {
      "limits": [
        {
          "counter": "printer_send_gcode_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

printer_send_gcode stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Bambu Lab MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Bambu Lab MCP Server tools

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Go deeper

High-risk tools in Bambu Lab MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about printer_send_gcode

What does the printer_send_gcode tool do? +

Send a single G-code command to the printer (e.g.,. It is categorised as a Execute tool in the Bambu Lab MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on printer_send_gcode? +

Register the Bambu Lab MCP Server MCP server in PolicyLayer and add a rule for printer_send_gcode: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Bambu Lab MCP Server. Nothing to install.

What risk level is printer_send_gcode? +

printer_send_gcode is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit printer_send_gcode? +

Yes. Add a rate_limit block to the printer_send_gcode rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block printer_send_gcode completely? +

Set action: deny in the PolicyLayer policy for printer_send_gcode. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides printer_send_gcode? +

printer_send_gcode is provided by the Bambu Lab MCP Server MCP server (schwarztim/bambu-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Bambu Lab MCP Server tool call.

Start from Bambu Lab MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →