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unofficial-bambu-mcp

unofficial-bambu-mcp

save_filament_preset

Saves a slot’s filament with its project tweaks as a Bambu Studio user preset that persists after restart; set replace to update an existing preset while keeping AMS slot links valid.

Instructions

Save the filament of a slot, with this project's changes for that slot (temperatures, flow ratio, pressure advance, plate temperatures...), as a Bambu Studio user preset; it appears after Bambu Studio restarts. A new filament (made from a Generic preset, or with another filament_vendor) is saved like Bambu Studio's Create Filament does: its own filament id, so it can be picked for an AMS slot (Device > AMS). Changes to a Bambu filament are saved as a variant of it, so its RFID spools still match it. replace=True updates an existing user preset with that name (e.g. after a calibration): it keeps its filament id, so AMS slots set to it stay valid, and a backup copy is kept. Never overwrites otherwise.

Input Schema

NameRequiredDescriptionDefault
nameYes
slotYes
replaceNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A4.3/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full burden and delivers: the preset appears only after a Bambu Studio restart, new filaments get their own filament id so they can be assigned to an AMS slot, variants keep RFID matching, replace=True preserves the filament id so AMS slots stay valid and keeps a backup copy, and nothing is overwritten otherwise.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with the core action and its effect, then mode distinctions and replace semantics. Dense but every sentence conveys distinct behavior; the parenthetical field list is the only mildly expendable element.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 3-parameter mutation tool with no annotations and no output schema, the description covers the meaningful effects: id assignment, AMS implications, restart requirement, and overwrite protection. The remaining gap is what 'slot' identifies and what happens on invalid slot/name.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0%, so the description must compensate. The replace parameter is fully explained (updates an existing preset by name, keeps filament id, keeps a backup, never overwrites otherwise), and 'name' is implied to be the preset name, but 'slot' is never clarified—AMS slot index, printer scope, or something else—so a key parameter remains ambiguous.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb+resource: save the filament of a slot with the project's per-slot changes (temperatures, flow ratio, pressure advance, plate temperatures) as a Bambu Studio user preset. It is clearly distinct from save_process_preset, save_printer_preset, and edit_preset/rename_preset.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explains the two modes explicitly: a new filament (from a Generic preset or another vendor) is saved like Bambu Studio's Create Filament, while changes to a Bambu filament become a variant. It also directs the agent to replace=True when updating an existing preset after a calibration instead of creating a duplicate.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.