Kiln

https://kiln3d.com/docs
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Kiln is the intelligence layer between idea and physical object. It provides a unified interface for...
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### Install Kiln3D

Source: https://kiln3d.com/docs

Install Kiln3D from PyPI or from source for development. Requires Python 3.10+.

```bash
# From PyPI
pip install kiln3d

# From source (development)
pip install -e ./kiln
```

--------------------------------

### Install Elegoo Adapter Dependencies

Source: https://kiln3d.com/docs

Install the necessary package for the Elegoo adapter using pip.

```bash
pip install 'kiln[elegoo]'
```

--------------------------------

### Clone Kiln Repository and Install Dependencies

Source: https://kiln3d.com/docs

Clone the Kiln repository and install the development dependencies for Kiln and octoprint-cli. This sets up the local environment for development.

```bash
git clone https://github.com/codeofaxel/Kiln.git
cd kiln
pip install -e "./kiln[dev]"
pip install -e "./octoprint-cli[dev]"
```

--------------------------------

### Perform First Print with Kiln3D

Source: https://kiln3d.com/docs

Check printer status, run preflight safety checks, upload a file, start printing, and wait for completion.

```bash
kiln status                    # Verify printer is online
kiln preflight --material PLA  # Run safety checks
kiln upload benchy.gcode       # Upload file to printer
kiln print benchy.gcode        # Start printing
kiln wait                      # Block until complete
```

--------------------------------

### Enable Kiln3D Authentication

Source: https://kiln3d.com/docs

Set environment variables to enable authentication and define a secret key. This is recommended for multi-user or network-exposed setups.

```bash
export KILN_AUTH_ENABLED=1
export KILN_AUTH_KEY=your_secret_key
```

--------------------------------

### Kiln3d Configuration File

Source: https://kiln3d.com/docs

Example configuration file for Kiln3d, specifying active printer and details for different printer types like Moonraker, OctoPrint, and Bambu. Settings like timeout and retries can also be defined.

```yaml
active_printer: my-voron

printers:
  my-voron:
    type: moonraker
    host: http://voron.local:7125

  ender3:
    type: octoprint
    host: http://octopi.local
    api_key: ABC123

  x1c:
    type: bambu
    host: 192.168.1.100
    access_code: "12345678"
    serial: "01P00A000000001"

settings:
  timeout: 30
  retries: 3
```

--------------------------------

### Run Kiln and Octoprint-CLI Tests

Source: https://kiln3d.com/docs

Execute the test suites for both the Kiln project and the octoprint-cli package. This verifies the functionality of the installed components.

```bash
cd kiln && python3 -m pytest tests/ -v    # public Kiln test suite
cd ../octoprint-cli && python3 -m pytest tests/ -v  # 223 tests
```

--------------------------------

### Slice and Print STL Files

Source: https://kiln3d.com/docs

Automatically detect and use PrusaSlicer or OrcaSlicer to convert an STL file to G-code, upload it, and start printing.

```bash
kiln slice benchy.stl --print-after
```

--------------------------------

### Configure Marketplace API Keys

Source: https://kiln3d.com/docs

Set environment variables for each marketplace to enable them for searches. Ensure you use the correct key type for each service.

```bash
export KILN_MMF_API_KEY=your_key               # MyMiniFactory developer key (recommended)
export KILN_CULTS3D_USERNAME=your_username      # Cults3D account username
export KILN_CULTS3D_API_KEY=your_key            # https://cults3d.com/en/api/keys
export KILN_THINGIVERSE_TOKEN=your_token        # Deprecated — Thingiverse acquired by MyMiniFactory (Feb 2026)
```

--------------------------------

### Elegoo (SDCP) Configuration

Source: https://kiln3d.com/docs

Configure the Elegoo adapter using the SDCP protocol. Specify type and host; mainboard_id is optional.

```yaml
type: elegoo
host: 192.168.1.50
mainboard_id: ABCD1234ABCD1234  # optional, auto-discovered
```

--------------------------------

### Configure Claude Desktop Integration

Source: https://kiln3d.com/docs

Add this configuration to `~/.config/Claude/claude_desktop_config.json` to integrate the MCP server with Claude Desktop. Ensure you replace placeholder values for API keys and hostnames.

```json
{
  "mcpServers": {
    "kiln": {
      "command": "python",
      "args": ["-m", "kiln", "serve"],
      "env": {
        "KILN_PRINTER_HOST": "http://octopi.local",
        "KILN_PRINTER_API_KEY": "your_key",
        "KILN_PRINTER_TYPE": "octoprint"
      }
    }
  }
}
```

--------------------------------

### Creality Diagnostics Command

Source: https://kiln3d.com/docs

Run this command to verify Creality adapter configuration and diagnose connectivity issues.

```bash
kiln doctor-creality --host 192.168.1.55 --model k1_max
```

--------------------------------

### Bambu Lab Configuration

Source: https://kiln3d.com/docs

Configure the Bambu Lab adapter for MQTT communication. Requires host, access code, and serial number.

```yaml
type: bambu
host: 192.168.1.100
access_code: "12345678"
serial: "01P00A000000001"
```

--------------------------------

### Discover Printers with Kiln3D

Source: https://kiln3d.com/docs

Scan your local network for 3D printers using mDNS and HTTP probing.

```bash
kiln discover
```

--------------------------------

### System Tools

Source: https://kiln3d.com/docs

Tools for monitoring system health, managing events, and configuring webhooks.

```APIDOC
## System Tools

### `kiln_health`

**Description**: Checks the health of the Kiln system, reporting version, uptime, and module status.

### `recent_events`

**Description**: Retrieves a list of recent system events.
**Input**: `limit` (integer, optional)

### `register_webhook`

**Description**: Registers a webhook to receive notifications for specified events.
**Input**: `url` (string), `events` (array of strings), `secret` (string)
**Output**: The ID of the registered webhook.

### `list_webhooks`

**Description**: Lists all registered webhooks.

### `delete_webhook`

**Description**: Deletes a registered webhook.
**Input**: `webhook_id` (string)
```

--------------------------------

### OctoPrint Configuration

Source: https://kiln3d.com/docs

Configure the OctoPrint adapter with its type, host, and API key. Requires an API key generated in OctoPrint settings.

```yaml
type: octoprint
host: http://octopi.local
api_key: YOUR_KEY
```

--------------------------------

### Verify Printer API Endpoints and Register by IP

Source: https://kiln3d.com/docs

Verify printer API endpoints using curl and register printers directly by IP address if discovery fails. Kiln works over Ethernet and Wi-Fi.

```bash
# Verify endpoint from your host:
curl http://192.168.1.44/api/v1/status                  # Prusa Link
curl http://192.168.1.50:7125/server/info               # Moonraker
curl http://192.168.1.55:7125/server/info               # Creality when local Moonraker is reachable
curl http://192.168.1.60/api/version                    # OctoPrint

# Register directly by IP (no discovery required):
kiln auth --name printer --host http://192.168.1.44 --type prusalink --api-key YOUR_KEY
```

--------------------------------

### Printability Analysis Tools

Source: https://kiln3d.com/docs

Tools for analyzing the printability of 3D models, including detailed dimension analysis, adhesion settings recommendations, auto-orientation, and support estimation.

```APIDOC
## Printability Analysis Tools

### Description
Provides a suite of tools to analyze the printability of 3D models (STL/OBJ). It offers a 7-dimension analysis for FDM printing readiness, generating a composite report with a score, grade, and actionable recommendations. It also includes tools for recommending adhesion settings, automatically orienting models, and estimating support material.

### Tools

#### `analyze_printability`

*   **Description**: Performs a comprehensive 7-dimension analysis of a 3D mesh.
*   **Input**: `file_path` (string), `nozzle_diameter` (float, optional), `layer_height` (float, optional), `max_overhang_angle` (float, optional), `build_volume_*` (various, optional).
*   **Output**: A `PrintabilityReport` object containing a score, grade, per-dimension results, and recommendations.

#### `recommend_adhesion_settings`

*   **Description**: Recommends brim or raft settings based on model geometry, material, and printer type.
*   **Input**: `file_path` (string), `material` (string), `printer_model` (string), `has_enclosure` (boolean).
*   **Output**: A dictionary of slicer overrides for brim/raft settings.

#### `auto_orient_model`

*   **Description**: Automatically orients a 3D model to minimize overhangs and maximize bed contact.
*   **Input**: `file_path` (string), `output_path` (string).
*   **Output**: The auto-rotated mesh saved to the specified output path.

#### `estimate_supports`

*   **Description**: Estimates the volume and weight of support material required for a given model.
*   **Input**: `file_path` (string).
*   **Output**: Support volume and weight estimates.
```

--------------------------------

### Print Learning & Cross-Printer Intelligence (Pro Tier)

Source: https://kiln3d.com/docs

Tools for aggregating print insights, recommending settings, and predicting maintenance.

```APIDOC
## Print Learning & Cross-Printer Intelligence (Pro Tier)

### `get_print_learning_summary`
#### Description
Aggregates learning insights, including what works, what fails, and material success rates.

### `get_optimal_settings`
#### Description
Recommends optimal print settings based on historical outcomes for a given material and printer.

### `get_material_success_rates`
#### Description
Provides success and failure rates for each material across the entire fleet.

### `get_maintenance_prediction`
#### Description
Generates predictive maintenance alerts based on the analysis of failure patterns.

### `get_print_confidence`
#### Description
Calculates a confidence score for an upcoming print based on historical data.

### `record_print_outcome`
#### Description
Records the outcome of a print (success, failure, or partial) along with the settings used and a quality grade.
```

--------------------------------

### Moonraker Configuration

Source: https://kiln3d.com/docs

Configure the Moonraker adapter with its type and host. No authentication is required by default.

```yaml
type: moonraker
host: http://voron.local:7125
```

--------------------------------

### Creality Configuration

Source: https://kiln3d.com/docs

Configure the Creality adapter for modern CrealityOS/Klipper printers. Specify the type, host, and printer model.

```yaml
type: creality
host: 192.168.1.55
printer_model: k1_max
```

--------------------------------

### MCP Resources

Source: https://kiln3d.com/docs

Read-only resources for agent context.

```APIDOC
## MCP Resources

### `kiln://status`
#### Description
Provides a system-wide snapshot of the current status.

### `kiln://printers`
#### Description
Lists all printers in the fleet.

### `kiln://printers/{name}`
#### Description
Retrieves detailed information for a specific printer.
#### Parameters
- `name` (string) - Required - The name of the printer.

### `kiln://queue`
#### Description
Provides a summary of the job queue.

### `kiln://queue/{job_id}`
#### Description
Retrieves detailed information for a specific job in the queue.
#### Parameters
- `job_id` (string) - Required - The ID of the job.

### `kiln://events`
#### Description
Lists the most recent events (last 50).
```

--------------------------------

### Job Queue Tools

Source: https://kiln3d.com/docs

Tools for managing print jobs in a queue.

```APIDOC
## Job Queue Tools

### `submit_job`

**Description**: Submits a print job to the queue. If no printer is specified, it will be routed to the best-performing printer based on historical data.
**Input**: `filename` (string), `printer` (string, optional), `priority` (integer, optional), `metadata` (object, optional)
**Output**: The unique ID of the submitted job.

### `job_status`

**Description**: Retrieves the current state and progress of a specific job.
**Input**: `job_id` (string)

### `queue_summary`

**Description**: Provides an overview of the current print job queue.

### `cancel_job`

**Description**: Cancels a job from the queue.
**Input**: `job_id` (string)
```

--------------------------------

### Design Provenance & Version Intelligence (Pro Tier)

Source: https://kiln3d.com/docs

Tools for managing design versions, tracking provenance, and detecting regressions.

```APIDOC
## Design Provenance & Version Intelligence (Pro Tier)

### `save_design_version`
#### Description
Saves a design version with its parametric source and provenance metadata.

### `get_design_version`
#### Description
Retrieves a design version along with its full ancestry chain.

### `diff_design_versions`
#### Description
Calculates the geometric difference between two design versions.

### `compare_design_versions`
#### Description
Provides a side-by-side comparison of two design versions.

### `check_design_regression`
#### Description
Detects if a design change has caused a regression in print success.

### `record_design_version_outcome`
#### Description
Records the outcome of a print against a specific design version.

### `get_proven_recipe`
#### Description
Queries the provenance history to find the best-performing parameters for a given material and printer.

### `get_regression_alerts`
#### Description
Retrieves active regression alerts for designs that have stopped printing successfully.

### `dismiss_regression_alert`
#### Description
Dismisses a regression alert after it has been investigated.

### `best_design_version`
#### Description
Identifies the best-performing design version for a specific material and printer combination.
```

--------------------------------

### Prusa Link Configuration

Source: https://kiln3d.com/docs

Configure the Prusa Link adapter with its type, host, and API key. Uses the Prusa Link REST API.

```yaml
type: prusalink
host: http://prusa-mk4.local
api_key: YOUR_KEY
```

--------------------------------

### Material Tracking Tools

Source: https://kiln3d.com/docs

Tools for tracking and managing filament materials loaded onto printers.

```APIDOC
## Material Tracking Tools

### `set_material`

**Description**: Sets the currently loaded material information for a specific printer and tool.
**Input**: `printer_name` (string), `material` (string), `color` (string), `spool_id` (string), `tool_index` (integer)

### `get_material`

**Description**: Retrieves the currently loaded material information for a printer.
**Input**: `printer_name` (string)

### `check_material_match`

**Description**: Checks if the loaded material matches the expected material.
**Input**: `printer_name` (string), `expected_material` (string)
**Output**: Match result or warning.

### `list_spools`

**Description**: Lists all spools in the inventory.

### `add_spool`

**Description**: Adds a new spool to the inventory.
**Input**: `material` (string), `color` (string), `brand` (string), `weight` (number), `cost` (number)
**Output**: Details of the added spool.

### `remove_spool`

**Description**: Removes a spool from the inventory.
**Input**: `spool_id` (string)
```

--------------------------------

### Consumer Workflow

Source: https://kiln3d.com/docs

Tools for a consumer-facing workflow that does not require a printer.

```APIDOC
## consumer_onboarding

### Description
Provides a step-by-step guide from idea conception to product delivery.

### Input
- None

### Output
- Step-by-step guide.
```

```APIDOC
## validate_shipping_address

### Description
Validates and normalizes shipping addresses.

### Input
- `street` (string) - The street address.
- `city` (string) - The city.
- `country` (string) - The country.
- `state` (string) - The state or province.
- `postal_code` (string) - The postal code.

### Output
- Validated and normalized address.
```

```APIDOC
## suggest_material_for_order

### Description
Recommends materials for an order based on use case, budget, and constraints.

### Input
- `use_case` (string) - The intended use of the product.
- `budget` (float) - The budget for the material.
- `constraints` (object) - Any specific constraints.

### Output
- Ranked material recommendations with reasoning.
```

```APIDOC
## estimate_price

### Description
Provides an instant price range for a given technology, volume, or dimensions. This does not involve an API call.

### Input
- `technology` (string) - The printing technology.
- `volume_cm3` (float) or `dimensions` (object) - The volume in cubic centimeters or object dimensions.

### Output
- Estimated price range.
```

```APIDOC
## estimate_timeline

### Description
Estimates the order-to-delivery timeline, including a breakdown of stages.

### Input
- `technology` (string) - The printing technology.
- `quantity` (integer) - The number of items.
- `country` (string) - The destination country.

### Output
- Estimated timeline with stage breakdown.
```

```APIDOC
## supported_shipping_countries

### Description
Lists the countries supported for shipping.

### Input
- None

### Output
- List of supported shipping countries.
```

--------------------------------

### Multi-Part Assembly & Job Splitting Tools

Source: https://kiln3d.com/docs

Tools for splitting large models or multi-part assemblies across multiple printers for parallel printing, with options for build volume overflow, multi-copy distribution, and assembly splitting.

```APIDOC
## Multi-Part Assembly & Job Splitting Tools

### Description
These tools enable the splitting of large models or multi-part assemblies to be printed in parallel across multiple printers. Supported splitting modes include managing build volume overflow, distributing multiple copies of a model, and splitting assemblies with reassembly instructions.

### Tools

#### `plan_multi_copy_split`

*   **Description**: Plans the distribution of multiple copies of a model across a fleet of printers.
*   **Input**: `file_path` (string), `copies` (integer), `material` (string).
*   **Output**: A `SplitPlan` object detailing per-printer assignments and estimated time savings.

#### `plan_assembly_split`

*   **Description**: Plans the distribution of parts from a multi-STL assembly across printers, including reassembly instructions.
*   **Input**: `file_paths` (list of strings), `material` (string).
*   **Output**: A `SplitPlan` object with part-to-printer mapping and assembly instructions.

#### `split_plan_status`

*   **Description**: Retrieves the current status of an ongoing split plan, including per-part progress and estimated remaining time.
*   **Input**: `plan_id` (string).
*   **Output**: A `SplitProgress` object with status details.

#### `cancel_split_plan`

*   **Description**: Cancels an active split plan.
*   **Input**: `plan_id` (string).
*   **Output**: Confirmation of cancellation.
```

--------------------------------

### Add Printers to Kiln3D

Source: https://kiln3d.com/docs

Authenticate and add printers to Kiln3D. Supports various printer types and connection methods, including direct USB.

```bash
# OctoPrint
kiln auth --name ender3 --host http://octopi.local --type octoprint --api-key YOUR_KEY

# Moonraker
kiln auth --name voron --host http://voron.local:7125 --type moonraker

# Creality K1/K2/Hi-class local Moonraker
kiln doctor-creality --host 192.168.1.55 --model k1_max
kiln auth --name k1max --host 192.168.1.55 --type creality --printer-model k1_max

# Prusa Link
kiln auth --name prusa-mini --host http://192.168.1.44 --type prusalink --api-key YOUR_KEY

# Bambu Lab
kiln auth --name x1c --host 192.168.1.100 --type bambu --access-code 12345678 --serial 01P00A000000001

# Elegoo SDCP
kiln auth --name saturn --host 192.168.1.50 --type elegoo

# Direct USB / Serial
kiln auth --name ender3-usb --host /dev/tty.usbserial-0001 --type serial
```

--------------------------------

### Cost Estimation Tools

Source: https://kiln3d.com/docs

Tools for estimating the cost of printing a model.

```APIDOC
## Cost Estimation Tools

### `estimate_cost`

**Description**: Estimates the filament and electricity costs for printing a given file.
**Input**: `file_path` (string), `material` (string), `electricity_rate` (number), `printer_wattage` (number)
**Output**: Total estimated cost including filament and electricity.

### `list_materials`

**Description**: Lists available material profiles, including brand-specific filament details, densities, and costs.
```

--------------------------------

### Adaptive Slicing Tools

Source: https://kiln3d.com/docs

Tools for analyzing model geometry and generating per-region layer height optimizations for adaptive slicing.

```APIDOC
## Adaptive Slicing Tools

### Description
Tools to analyze model geometry and generate optimized adaptive slicing plans, which involve per-region layer height adjustments. This can lead to significant print time savings compared to uniform layer heights.

### Tools

#### `generate_adaptive_slicing_plan`

*   **Description**: Analyzes model geometry to create a detailed adaptive slicing plan with per-region layer height optimizations.
*   **Input**: Model geometry data.
*   **Output**: An adaptive slicing plan.

#### `quick_adaptive_plan`

*   **Description**: An all-in-one function to analyze a model and generate an adaptive slicing plan quickly.
*   **Input**: Model geometry data.
*   **Output**: An adaptive slicing plan.

#### `export_adaptive_slicer_config`

*   **Description**: Exports a generated adaptive slicing plan into a configuration format compatible with popular slicers like PrusaSlicer, OrcaSlicer, or Cura.
*   **Input**: Adaptive slicing plan, target slicer format.
*   **Output**: Slicer configuration file.

#### `estimate_adaptive_time_savings`

*   **Description**: Estimates the potential print time savings achieved by using an adaptive slicing plan compared to a standard uniform layer height approach.
*   **Input**: Adaptive slicing plan, model data.
*   **Output**: Estimated time savings (e.g., percentage or duration).

#### `get_adaptive_plan_summary`

*   **Description**: Generates a human-readable summary of an adaptive slicing plan, detailing the optimizations and expected outcomes.
*   **Input**: Adaptive slicing plan.
*   **Output**: A textual summary of the plan.
```

--------------------------------

### File Management Tools

Source: https://kiln3d.com/docs

Tools for managing files on the printer or connected storage.

```APIDOC
## File Management Tools

### `printer_files`

**Description**: Lists all files available on the printer, including their sizes and dates.

### `upload_file`

**Description**: Uploads a file from the local system to the printer.
**Input**: `local_path` (string)
```

--------------------------------

### Monitoring Tools

Source: https://kiln3d.com/docs

Tools for monitoring print jobs, capturing snapshots, and reporting status.

```APIDOC
## Monitoring Tools

### `printer_snapshot`

**Description**: Captures a snapshot of the printer's current state.
**Input**: `save_path` (string, optional)
**Output**: Image bytes or base64 encoded string.

### `monitor_print`

**Description**: Provides a detailed report of the ongoing print job, including status, temperatures, speed, camera feed, and comments.
**Input**: `printer_name` (string), `include_snapshot` (boolean, optional)

### `multi_copy_print`

**Description**: Arranges multiple copies of a model on the print bed, slices them, and initiates printing.
**Input**: `model_path` (string), `copies` (integer), `spacing_mm` (number)
```

--------------------------------

### Slicing Tools

Source: https://kiln3d.com/docs

Tools for slicing 3D models into G-code and managing slicer configurations.

```APIDOC
## Slicing Tools

### `slice_model`

**Description**: Slices a 3D model into G-code using specified parameters.
**Input**: `input_path` (string), `profile` (string), `output_dir` (string)
**Output**: Path to the generated G-code file and slicer information.

### `find_slicer`

**Description**: Detects the path and version of the installed slicer.

### `slice_and_print`

**Description**: Slices a model and immediately initiates printing the resulting G-code.
**Input**: `input_path` (string), `profile` (string)
```

--------------------------------

### Fleet Management Tools

Source: https://kiln3d.com/docs

Tools for managing multiple printers within a fleet.

```APIDOC
## Fleet Management Tools

### `fleet_status`

**Description**: Retrieves the status of all printers in the fleet.

### `register_printer`

**Description**: Registers a new printer with the fleet management system.
**Input**: `name` (string), `type` (string), `host` (string), ... (additional parameters may be required)
```

--------------------------------

### Elegoo Environment Variables

Source: https://kiln3d.com/docs

Set environment variables for the Elegoo adapter configuration. These can override settings in the configuration file.

```bash
export KILN_PRINTER_HOST=192.168.1.50
export KILN_PRINTER_TYPE=elegoo
export KILN_PRINTER_MAINBOARD_ID=ABCD1234  # optional
```

--------------------------------

### Model Discovery Tools

Source: https://kiln3d.com/docs

Tools for searching, retrieving, and managing 3D models from various marketplaces.

```APIDOC
## Model Discovery Tools

### `search_all_models`

**Description**: Searches for models across all connected marketplaces, returning interleaved results.
**Input**: `query` (string), `page` (integer, optional), `sources` (array of strings, optional)

### `marketplace_info`

**Description**: Retrieves information about connected model marketplaces and setup hints.

### `search_models`

**Description**: Searches for models within a specific marketplace (e.g., Thingiverse - deprecated).
**Input**: `query` (string), `page` (integer, optional)

### `model_details`

**Description**: Fetches detailed metadata for a specific model.
**Input**: `thing_id` (string)

### `model_files`

**Description**: Lists the files associated with a specific model.
**Input**: `thing_id` (string)

### `download_model`

**Description**: Downloads a model to the local system.
**Input**: `thing_id` (string), `file_id` (string)
**Output**: The local path to the downloaded file.

### `download_and_upload`

**Description**: Downloads a model file and uploads it directly to a specified printer.
**Input**: `file_id` (string), `source` (string), `printer_name` (string)

### `browse_models`

**Description**: Browses models based on sorting criteria and category.
**Input**: `sort` (string, optional), `category` (string, optional)

### `list_model_categories`

**Description**: Lists available model categories.
```

--------------------------------

### Mid-Print Modification & Resume (Pro Tier)

Source: https://kiln3d.com/docs

Tools for modifying and resuming prints in progress.

```APIDOC
## Mid-Print Modification & Resume (Pro Tier)

### `plan_mid_print_decoration`
#### Description
Plans a decoration injection on a paused or running print.

### `apply_mid_print_decoration_plan`
#### Description
Executes a planned mid-print decoration with atomic dual-artifact revert.

### `resume_interrupted_print`
#### Description
Resumes an interrupted print from the exact layer it stopped. Compatible with various printer firmwares and systems.

### `analyze_mid_print_impact`
#### Description
Performs a structural impact analysis of a proposed mid-print modification.

### `preview_mid_print_session`
#### Description
Previews the visual outcome of a mid-print modification before committing.

### `cancel_print_recovery`
#### Description
Cancels an ongoing print recovery session.

### `generate_recovery_gcode`
#### Description
Generates safe resume G-code with a loaded-bed preamble.
```
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