set_fan_speed · Bambu Printer MCP: Risk & Policy

WHAT IT DOES

What set_fan_speed does on Bambu Printer

AI agents invoke set_fan_speed to trigger actions in Bambu Printer. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why set_fan_speed needs a policy

This tool sends a control command to physical hardware (a Bambu printer) to change the fan speed. It triggers an external operation on a real device, making it Execute category. Misuse could affect print quality or cause hardware issues, warranting medium severity.

From the tool's definition Set a Bambu printer fan speed percentage using the printer

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_fan_speed Rate-limited

set_fan_speed 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.

View as policy code

policy.json

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

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Bambu Printer, so you can run agents against it safely.

FAQ

Questions about set_fan_speed

What does the set_fan_speed tool do? +

Set a Bambu printer fan speed percentage using the printer. It is categorised as a Execute tool in the Bambu Printer MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on set_fan_speed? +

Register the Bambu Printer MCP server in PolicyLayer and add a rule for set_fan_speed: 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 Printer. Nothing to install.

What risk level is set_fan_speed? +

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

Can I rate-limit set_fan_speed? +

Yes. Add a rate_limit block to the set_fan_speed 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 set_fan_speed completely? +

Set action: deny in the PolicyLayer policy for set_fan_speed. 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 set_fan_speed? +

set_fan_speed is provided by the Bambu Printer MCP server (rowbotik/bambu-printer-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.