slice_stl
Destructive
Slices STL or 3MF files into printer-safe G-code or sliced 3MF for a specified Bambu Lab model, with options for quality, strength, supports, orientation, and plate layout.
Instructions
Slice an STL or 3MF file using a slicer to generate printable G-code or sliced 3MF. IMPORTANT: bambu_model must be specified to ensure the slicer generates safe G-code for the correct printer. The text result is the sliced file's path. When Bambu Studio or OrcaSlicer writes a result.json, structuredContent.slicer_result carries it verbatim, success or error: error_string, return_code and each sliced_plates[].warning_message, such as a floating cantilever. structuredContent.slicer_report says whether it failed; for a failure, its message is a plain sentence for a person and slicer_message keeps the slicer's words, which a failed slice's text gives after that sentence. A 3MF that carries its own process settings (a designer's Bambu Studio or Orca project) slices with them unless slicer_profile, template_name or template_3mf_path is given; the machine still comes from bambu_model. quality and strength adjust that process, and strength never lowers its walls or infill.
Tool call template
Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.
{
"id": 1,
"jsonrpc": "2.0",
"method": "tools/call",
"params": {
"arguments": {
"stl_path": "<stl_path>",
"bambu_model": "<bambu_model>"
},
"name": "slice_stl"
}
}Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| scale | No | Uniform scale factor applied to all axes. 1.0 = original size, 2.0 = double, 0.5 = half. Applied before slicing. | |
| orient | No | Auto-orient the model for optimal printability (minimize supports, maximize bed adhesion). Recommended for raw STL imports that lack a pre-set orientation. | |
| rotate | No | Rotate the model around the Z-axis (vertical) by this many degrees before slicing. Positive = counterclockwise when viewed from above. | |
| arrange | No | Auto-arrange all objects on the build plate with optimal spacing; STL input is arranged by default. Set false only to keep a 3MF's existing layout: an STL that is not already on the plate then fails to slice. | |
| quality | No | Print quality: draft (thicker layers, faster), standard (the preset's own layer height) or fine (thinner layers). The server picks the layer height for the nozzle in use; an explicit layer_height wins. | |
| bed_type | No | Bed plate type for slicing (default: textured_plate). | |
| min_save | No | Write a smaller output 3MF by omitting non-essential metadata. Reduces file size for faster FTP upload to the printer. | |
| rotate_x | No | Rotate the model around the X-axis by this many degrees before slicing. Useful for reorienting prints for better layer adhesion. | |
| rotate_y | No | Rotate the model around the Y-axis by this many degrees before slicing. Useful for reorienting prints for better layer adhesion. | |
| stl_path | Yes | Path to the STL or 3MF file to slice | |
| strength | No | Part strength: standard (the process's own walls and infill), strong or max (at least more walls and denser infill; a process that already has more keeps it). The server picks the values; explicit wall_loops or sparse_infill_density win. | |
| uptodate | No | Refresh 3MF preset configs to match the latest BambuStudio version. Use when slicing downloaded or older 3MF files to prevent stale-config failures. | |
| wall_loops | No | Number of walls (perimeters), written as the process preset's wall_loops. Bambu-compatible slicers only. | |
| bambu_model | Yes | REQUIRED: Bambu Lab printer model. Ask the user if not known. Using the wrong model can damage the printer. | |
| nozzle_type | No | Bambu-compatible slicing: the hotend nozzle material installed on the printer (default: BAMBU_NOZZLE_TYPE, else the model preset's stock nozzle, usually stainless_steel). Printing compares it with the printer's reported nozzle. | |
| repetitions | No | Slice N identical copies of the model. Bambu Studio and OrcaSlicer copy an STL with --clone-objects; do not also pass clone_objects. Copies may need multiple plates; print_3mf prints one selected plate per call. For 3MF input, select slice_plate explicitly. | |
| slice_plate | No | Which plate index to slice. 0 = all plates for local slicers; remote slicing defaults to plate 1 and rejects 0. Use 1, 2, etc. to slice only a specific plate in multi-plate 3MF projects. | |
| slicer_path | No | Path to the slicer executable (default: value from env). Per-call overrides require MCP_ALLOW_EXECUTABLE_ARG=1. | |
| slicer_type | No | Type of slicer to use. Bambu-compatible choices (bambustudio, orcaslicer, orcaslicer-bambulab) export sliced 3MF; aliases such as fulu-orca and orca-studio are accepted. | |
| layer_height | No | Layer height in mm, such as 0.28 (draft), 0.2 (standard) or 0.12 (fine). Written as the process preset's layer_height over the machine and process preset this tool resolves; at most the nozzle diameter. Bambu-compatible slicers only. | |
| skip_objects | No | Skip these object copies when slicing, by identify_id, comma-separated (e.g. '78,92'). The ids are the instances list_3mf_plates gives for each plate; they are not positions. Useful for multi-object 3MFs where you only want to print some parts. | |
| support_type | No | Support style, written as the process preset's support_type. Bambu-compatible slicers only. | |
| template_dir | No | Optional template directory override when resolving template_name. | |
| clone_objects | No | Clone the loaded model: total copies as a single integer, e.g. '3'. The Bambu-style CLIs count copies per input file and this tool loads one file, so a comma-separated list is rejected by the slicer. | |
| ensure_on_bed | No | Detect models floating above the bed and lower them onto the build surface. Safety net for imported models with incorrect Z origins. | |
| template_name | No | Optional named template from the local registry. Resolves to template_3mf_path automatically. | |
| allow_mix_temp | No | Allow filaments with different temperature requirements on the same plate. Required for multi-material prints mixing e.g. PLA and PETG. | |
| enable_support | No | Turn support generation on or off, written as the process preset's enable_support. Bambu-compatible slicers only. | |
| load_filaments | No | Override filament profiles. Semicolon-separated paths to filament JSON configs, e.g. 'pla_basic.json;petg_cf.json'. | |
| slicer_profile | No | Path to an optional process profile/config file. The exact bambu_model/nozzle machine preset is still required. | |
| nozzle_diameter | No | Nozzle diameter in mm (default: 0.4) | |
| pause_at_layers | No | Pause before each of these layers (1-based, as Bambu Studio and OrcaSlicer number them in the preview), for example to drop in magnets or nuts. The slicer writes the printer's own pause G-code there (M400 U1 on Bambu printers); the printer stops by itself and waits for Resume. Bambu Studio or OrcaSlicer CLI only. Pauses already in a project 3MF are kept. | |
| enable_timelapse | No | Insert timelapse parking moves into gcode. The toolhead parks at a fixed position each layer for camera capture. Adds ~10% print time. | |
| filament_colours | No | Optional slot colours, one #RRGGBB per filament slot in order, separated by ';' (e.g. '#161616;#FFFFFF'). Defaults to the input 3MF's project colours, else the BambuStudio default. | |
| filament_profile | No | Compatibility alias for load_filaments. Semicolon-separated Orca/Bambu filament profile JSON paths. | |
| load_filament_ids | No | Map filaments to objects/parts. Comma-separated IDs matching load_filaments order, e.g. '1,2,3,1' assigns filament 1 to objects 0 and 3. | |
| template_3mf_path | No | Optional template 3MF whose embedded Bambu slicer settings should be reused when slicing a new STL or 3MF. | |
| nozzle_volume_type | No | Bambu-compatible slicing: the flow type of the nozzle installed on the printer (default: BAMBU_NOZZLE_VOLUME_TYPE, else standard). high_flow uses the presets' High Flow values, such as the filament's High Flow max volumetric speed, and is refused if the machine preset has no High Flow variant. Printing compares it with the printer's reported nozzle flow. | |
| skip_modified_gcodes | No | Strip custom start/end gcodes embedded in the 3MF. Recommended for downloaded 3MFs since custom gcodes from other users' profiles may be unsafe for your printer. | |
| sparse_infill_density | No | Sparse infill density as a percentage, such as "15%", written as the process preset's sparse_infill_density. Bambu-compatible slicers only. | |
| use_printer_filaments | No | When true, and no explicit slicer profile or load_filaments override is provided, use the printer's current or first loaded AMS filament as the slicer filament profile. Template 3MF process settings can still be used at the same time. | |
| support_threshold_angle | No | Overhang threshold in degrees for automatic supports, written as the process preset's support_threshold_angle (0 lets the slicer decide). Bambu-compatible slicers only. |