Atlas / MCP servers / codeofaxel / Kiln

KilnBLOCK

Name: Kiln
Author: codeofaxel

mcp/codeofaxel/kiln

MCP server by codeofaxel · 3d printing · ai · ai agents · Audited 2026-10-08

Describe it or draw it — Kiln makes it real. The open-source MCP server for 3D printing: AI agents (Claude, Codex, Cursor, or any MCP client) design, generate, slice & print on Bambu Lab, Creality, Prusa, Elegoo, Klipper/Moonraker, OctoPrint, Duet/RepRapFirmware & any Marlin printer.

Verdict

BLOCK

Grade

Trust score

36 /100

Exposed tools

200 224r · 61w · 6d

Transport

stdio

License

AGPL-3.0

Stars

Overview

From the repository's own README, as read at the audited commit. Badges and raw HTML are left out.

The open-source MCP server for 3D printing.

Kiln lets AI agents (Claude Desktop, Claude Code, Codex, or any custom MCP client) drive real 3D printers end to end — Bambu Lab, Creality, Prusa, Elegoo, Voron, Sovol, AnkerMake, Artillery, FlashForge, QIDI, RatRig, and SparkX, over OctoPrint, Moonraker/Klipper, PrusaLink, and Direct USB.

In a single conversation, an agent can design a part, slice it, queue it on the right printer, monitor the camera, recover from failures, and ship the result. No human in the middle.

Reading this as an AI agent? **kiln3d.com/agents** is written for you rather than for the person running you: install, MCP config, the design-to-print loop, and exactly what Kiln will refuse to do and why.

pip install kiln3d

Read from source at commit 6b5e5ba35f29OBSERVED · 2026-10-08

Connect

Built from this server's own package name, version and transport as found in its source — not copied from anyone's documentation, so it cannot drift against a page we do not control. Replace the environment placeholders with a token scoped to the least it needs.

claude-code (pypi)

claude mcp add kiln3d --env KILN_PRINTER_API_KEY=${KILN_PRINTER_API_KEY} -- uvx kiln3d==1.4.1.1 serve

Exposed tools (200)

224 read · 61 write · 6 destructive. Blast radius: 6 tools can delete or overwrite — an agent that can be talked into calling a tool can be talked into calling this one.

Tool	Risk	Description
`acquire_printer_lock`	read	Acquire an exclusive lock on a printer for safe concurrent access.
`add_assembly_interface`	write	Add a mating interface between two parts in an assembly.
`add_assembly_part`	write	Add a part to an existing assembly.
`add_mesh_chamfer`	write	Bevel a part
`add_mesh_fillet`	write	Round a part
`analyze_design_requirements`	read	Analyze a functional requirement and return technical recommendations.
`analyze_generation_feedback`	read	Analyze a generated model and get feedback for improvement.
`analyze_non_manifold_edges`	read	Count and classify non-manifold edges in a mesh.
`analyze_print_failure_smart`	read	Classify a print failure and suggest recovery steps.
`analyze_scad_code`	read	Analyze the structure of OpenSCAD code.
`analyze_structural_risks`	read	Analyze an STL mesh for structural weak points.
`analyze_warping_risk`	read	Analyze warping risk for a 3D model based on geometry and material.
`apply_decoration`	write	Apply a saved decoration to a new model — proven settings, one call.
`apply_design_reinforcements`	write	Analyze a part for structural risks, then auto-apply fixes.
`arrange_parts_on_plate`	read	Pack multiple STL files onto a virtual build plate.
`assess_load_bearing`	read	Analyze load-bearing characteristics of a mesh from its geometry.
`audit_original_design`	write	Run a ruthless audit of an original design before printing.
`auto_arrange_parts_on_plate`	read	Calculate non-overlapping XY positions for multiple parts on a print plate.
`auto_color_by_height`	read	Split a 3D model into horizontal color zones by Z-height.
`auto_color_by_region`	read	Split a 3D model into color zones by geometric region.
`auto_orient_model`	read	Find the optimal print orientation for a 3D model.
`await_generation`	read	Wait for a generation job to complete and return the final status.
`backup_database`	read	Back up the Kiln database with optional credential redaction.
`boolean_mesh_op`	read	Perform a CSG boolean operation on two or more STL meshes.
`build_generation_prompt`	read	Build a design-aware generation prompt for original 3D creation.
`build_parametric_prompt`	read	Build a prompt optimized for parametric OpenSCAD code generation.
`cache_design`	read	Cache a 3D design file for faster access and version tracking.
`cache_design_with_source`	read	Cache a design file alongside its parametric source code.
`cache_model`	write	Add a 3D model file to the local cache for reuse across jobs.
`can_ask`	read	Whether this connection
`cancel_print_recovery`	read	Cancel an active recovery session.
`cancel_print_service_order`	write	Cancel a print service order.
`cancel_split_plan`	read	Cancel all pending/in-progress parts of a split plan.
`center_model_on_bed`	read	Center a mesh on the build plate and place at z=0.
`check_assembly_clearances`	read	Check clearances between all mating parts in an assembly.
`check_firmware_status`	read	Check firmware version for a specific printer by name (fleet-level, firmware manager).
`check_material_environment`	read	Check whether a material is compatible with an environment, and
`check_material_sufficiency`	read	Check if a printer has enough material for a print job.
`check_multi_material_pairing`	read	Check if two materials can be co-printed in dual extrusion.
`check_my_tier`	read	Check the user
`check_print_health`	read	Perform a single-shot health assessment of the current print.
`check_print_readiness`	read	Single-call print readiness check with optional auto-repair.
`check_printer_material_compatibility`	read	Check if a specific printer can handle a material.
`check_step_support`	write	Check which STEP import backends are available on this system.
`community_stats`	read	Get overall print-registry statistics.
`compare_mesh_versions`	read	Compare two mesh files and report geometric differences.
`compile_scad`	read	Compile OpenSCAD source into a mesh.
`complete_print_recovery`	read	Mark a recovery session as completed.
`compose_assembly_parts`	read	Compose all assembly parts into a single output STL file.
`compose_models`	write	Merge multiple mesh files into a single combined model.
`compose_part_from_primitives`	read	Build a functional part by composing geometric primitives with booleans.
`confirm_print_recovery`	read	Confirm that a recovery plan should proceed.
`connect_provider_account`	read	Connect a local printer to a provider account (integration path).
`consent_window_status`	read	Which standing consent windows are open, for what, until when.
`consumer_onboarding`	read	Get the guided onboarding workflow for users without a 3D printer.
`contribute_community_print`	read	Contribute a print outcome to the community registry.
`create_assembly`	write	Create a new empty assembly.
`create_print_service_order`	write	Create a Print-as-a-Service order and get a quote.
`cross_section_view`	read	Compute a 2D cross-section of a mesh at a cutting plane.
`decoration_info`	read	Get full details about a saved decoration.
`decoration_quota_status`	read	Check your decoration quota — how many decorations you
`delete_agent_note`	destructive	Remove a stored note or preference.
`delete_cached_model`	destructive	Remove a model from the local cache (file and metadata).
`delete_shipping_profile`	destructive	Delete a saved local shipping profile.
`design_advisor`	read	Ask which generation method to use for a design idea (triage tool — call FIRST).
`design_improvement_plan`	read	Generate a complete structural improvement plan for a design.
`detect_mesh_pockets`	read	Detect pockets and cavities in a mesh before multi-part composition.
`detect_print_failure`	read	Analyze printer telemetry to detect and classify a print failure.
`diagnose_mesh`	read	Deep mesh defect analysis — self-intersections, holes, normals, fragments (defect-focused).
`diagnose_print_failure_live`	read	Diagnose a print failure using live printer state + model geometry.
`diff_design_versions`	read	Compute a unified diff between two design versions.
`discover_printers`	read	Scan the local network for 3D printers.
`donate_info`	read	Get crypto wallet addresses to tip/donate to the Kiln project.
`download_generated_model`	read	Download a completed generated model, check it, and open it on the stage.
`download_model`	read	Download model file(s) from a marketplace to local storage.
`estimate_before_design`	read	Estimate print time, cost, and filament usage BEFORE generating a model.
`estimate_cost`	read	Estimate the cost of a print job from a G-code file (already-sliced only).
`estimate_material_cost`	read	Estimate material usage and cost for printing a mesh.
`estimate_price`	read	Get an instant price estimate before requesting a full quote.
`estimate_print_progress`	read	Estimate print progress with phase-aware time prediction.
`estimate_print_time`	read	Estimate print time and filament usage for a model.
`estimate_structural_load`	read	Estimate safe structural load for a cantilevered section.
`estimate_support_material`	read	Estimate support material needed for a mesh.
`estimate_supports`	read	Estimate support volume for a 3D model.
`estimate_timeline`	write	Estimate order-to-delivery timeline with per-stage breakdown.
`export_model_3mf`	read	Export a mesh to 3MF format (preferred by modern slicers).
`extract_model_from_3mf`	read	Extract the embedded 3D model from a .3mf or .gcode.3mf file to STL.
`failure_history`	read	View failure history for a printer or failure type.
`find_material_match`	read	Fuzzy-match a catalog entry from spool metadata.
`find_printers_with_material`	read	Find printers that have a specific material loaded.
`find_provider_capacity`	read	Find available provider capacity by material/location.
`find_similar_prints`	read	Find similar models in the print DNA knowledge base.
`find_slicer`	read	Check if a slicer (PrusaSlicer/OrcaSlicer) is available on the system.
`fingerprint_model`	read	Compute a geometric fingerprint for a 3D model file.
`firmware_status`	read	Check firmware updates on the default/connected printer (adapter-level, no name needed).
`first_layer_status`	read	Check the status of a first-layer monitor.
`forecast_material_consumption`	write	Forecast when a material type will run out.
`fulfillment_alerts`	write	Check for fulfillment order alerts (stalled, failed, cancelled orders).
`fulfillment_cancel`	write	Cancel a fulfillment order (if still cancellable).
`fulfillment_materials`	read	List available materials from external manufacturing services.
`fulfillment_order`	write	Place a manufacturing order based on a previous quote.
`fulfillment_order_status`	write	Check the status of a fulfillment order.
`fulfillment_quote`	read	Get a manufacturing quote for a 3D model from Craftcloud.
`generate_and_print`	write	Full pipeline: generate a model, validate, slice, and upload (preview).
`generate_model`	read	Generate a 3D model from a text prompt via external AI API (Meshy/etc).
`generate_model_from_image`	read	Make a 3D model from a reference image.
`generate_model_with_provider`	read	Generate a printable design via an external AI provider.
`generate_print_certificate`	read	Generate a print
`generate_template_variations`	read	Generate multiple variations of a parametric template.
`generate_texture`	read	Cloud AI texture generation (requires Meshy API key + internet).
`generation_feedback_loop_status`	read	Check the status of a generation feedback loop.
`generation_status`	read	Check the status of a model generation job.
`get_active_material`	read	Get the filament physically active in the AMS hardware right now (Bambu Lab).
`get_cached_design`	read	Retrieve a cached design by ID.
`get_cached_model`	read	Return details for a specific cached model.
`get_community_insight`	read	Get aggregated print data for a model geometry.
`get_design_source`	read	Retrieve the parametric source code for a cached design.
`get_design_version`	read	Retrieve a single design version by its ID.
`get_fleet_material_summary`	read	Aggregate material inventory across all printers and spools.
`get_joint_recommendation`	read	Get recommended clearance settings for a joint type and material pairing.
`get_material_consumption_history`	read	Get material consumption history from completed prints.
`get_material_design_profile`	read	Compatibility lookup for a material
`get_material_info`	read	Get detailed information for a specific material by ID.
`get_material_purchase_urls`	read	Get purchase URLs for a material.
`get_model_print_history`	read	Get all print attempts for a model.
`get_post_processing_guide`	write	Get bounded public post-processing help for one goal.
`get_print_diagnostic`	read	Get a comprehensive print diagnostic combining multiple knowledge sources.
`get_printer_insights`	read	Query cross-printer learning insights for a specific printer.
`get_recovery_gcode_steps`	read	Get the G-code/commands for executing a recovery.
`get_recovery_plan`	read	Get a recovery plan for a specific failure type.
`get_recovery_session_status`	read	Get the current status of a recovery session.
`get_recovery_statistics`	read	Get historical recovery success rates and failure distribution.
`get_restock_suggestions`	read	Find materials running low and generate purchase links.
`get_safety_profile`	read	Get the full safety profile for a specific printer model.
`get_session_log`	read	Return the full audit log for an agent session.
`get_skill_manifest`	read	Get the Kiln skill manifest for agent self-discovery.
`get_slicer_profile`	read	Get the full bundled slicer profile for a printer model.
`get_started`	write	Quick-start guide for AI agents using Kiln.
`give_print_code`	read	Relay the code the person typed after Kiln showed one on their screen.
`hand_back_printer`	write	Tell Kiln you are taking a printer from here, so it can move on.
`health_check`	read	Return system health information for monitoring.
`hollow_mesh_model`	write	Create a hollow version of a mesh to save material.
`import_step_file`	write	Import a STEP (.step/.stp) CAD file and convert it for Kiln
`improve_generation_prompt`	read	Generate an improved prompt from feedback.
`infer_print_settings`	read	Infer optimal slicer settings from structural analysis.
`insert_into_scad`	write	Insert code into an OpenSCAD module without replacing it.
`issue_shipping_confirmation_token`	read	Issue a single-use token after the user confirms shipping details.
`iterate_design`	read	Automated design iteration: generate -> validate -> improve -> regenerate.
`job_history`	read	Get history of completed, failed, and cancelled print jobs.
`kiln_health`	read	Get a health check for the Kiln system.
`kiln_monitor_control`	read	Internal support for Kiln
`kiln_monitor_snapshot`	read	Internal support for Kiln
`kiln_signin`	write	Start a Kiln sign-in via OAuth.
`kiln_signin_poll`	read	Check whether a sign-in started by ``kiln_signin`` is done.
`kiln_spend_caps_confirm_change`	read	Confirm a cap change with the person
`kiln_spend_caps_confirm_order_approval`	write	Confirm a one-order approval with the person
`kiln_spend_caps_request_change`	write	Ask to raise the per-order and/or monthly spend cap (step 1 of 2).
`kiln_spend_caps_request_order_approval`	write	Ask to approve ONE order over the cap (step 1 of 2).
`kiln_spend_caps_show`	read	Show your current Kiln spend caps and whether chat may change them.
`kiln_startup_diagnosis`	write	Why the Kiln server failed to start, in plain language, with the fix.
`kiln_viewer_payload`	read	Internal support for Kiln
`list_available_materials`	read	List all available 3D printing materials with properties.
`list_cached_designs`	read	List cached designs, optionally filtered by material.
`list_cached_models`	read	List all models in the local cache, newest first.
`list_credentials`	read	List all stored credentials (metadata only, no plaintext).
`list_decorations`	read	List all saved decorations in the library.
`list_design_components`	read	List available pre-built OpenSCAD components from bundled libraries.
`list_design_materials`	read	List public material identifiers and safety/process summaries.
`list_design_templates_catalog`	read	Browse the whole design-template library, both kinds.
`list_design_versions`	read	List version history for a design, newest first.
`list_generation_providers`	read	List available text-to-3D generation providers.
`list_materials`	read	return {
`list_multi_material_addons`	write	List available multi-material add-on systems for 3D printers.
`list_print_pipelines`	read	List all available pre-validated print pipelines.
`list_printer_variants`	read	Show the curated hardware variants available for a printer.
`list_provider_capacity`	read	List printers registered with connected provider integrations.
`list_published_models`	read	List models that have been published to marketplaces.
`list_safety_profiles`	read	List all available printer safety profiles.
`list_shipping_profiles`	read	List saved local shipping profiles.
`list_slicer_profiles`	read	List all bundled slicer profiles for supported printers.
`list_trusted_printers`	read	Return the list of trusted printer hostnames/IPs.
`marketplace_diagnostics`	write	Run connectivity checks against all configured marketplaces.
`marketplace_status`	read	Check which 3D model marketplaces are connected and available.
`match_design_components`	read	Find pre-built library components matching a design description.
`match_design_requirements`	write	Identify which functional requirements apply to a design task.
`merge_mesh_files`	write	Combine multiple STL files into a single mesh file (simple concatenation).
`mesh_quality_scorecard`	read	Assess a model — a graded scorecard for a mesh, an intake
`mirror_mesh_model`	read	Mirror (reflect) a mesh along an axis.
`model_files`	read	List downloadable files for a Thingiverse model.
`model_revenue`	read	Get revenue summary for a specific model.
`modify_scad_module`	write	Replace a module in OpenSCAD code with new implementation.
`monitor_print`	read	One-shot print status report.
`monitor_print_vision`	read	Snapshot + structured data for AI visual inspection of an in-progress print.
`my_tool`	read	return {
`optimize_fleet_assignment`	read	Assign print jobs to printers by material availability.
`optimize_print_orientation`	read	Auto-rotate a mesh to minimize overhangs and maximize bed contact.
`optimize_template_params`	read	Find the structurally strongest version of a parametric template.
`paint_decoration_faces`	read	Paint exactly the faces a decoration carve created (Pro-free).
`parse_scad_parameters`	read	Parse parameter variables from OpenSCAD code.
`pipeline_abort`	read	Abort a running or paused pipeline.

Trust audit

BLOCKgrade F · trust 36/100 Do not install this without reading the findings. The audit found something that could harm you or your machine.

Layer	What it checks	Result
L0	Provenance & inventory	WARN
L1	Static analysis of the code	FAIL
L2	Instruction surface (what it tells the agent)	FAIL
L3	Class-specific surface	WARN
L4	Behavioural (sandbox)	SKIPPED

What the source does

Filesystem: declared (11 observation(s))
Network: declared (11 observation(s))
Shell: declared (10 observation(s))
Dependencies: pinned
Secrets in source: found

Findings (25)

HIGHCode injection · code.eval_exec · CWE-78, CWE-94, CWE-95

scripts/audit_import_targets.py:522

exec(compile(Path(args.known_from).read_text(encoding="utf-8"), args.known_from, "exec"), namespace)

Why it matters. evaluates text as code

Fix. remove; use a parser or a dispatch table

HIGHNetwork egress · net.tls_off · CWE-200, CWE-319

kiln/src/kiln/bridge_client.py:586

session = self._session_verdict(verify=False)

Why it matters. certificate verification is disabled

Fix. leave verification on

HIGHPrompt injection · prompt.credential_read · CWE-94, CWE-1427

SKILL.md:80

- Never repeat a printer access code or an API key back in the conversation.

Why it matters. asks the agent to read credentials

MEDIUMInventory / provenance · inv.binary · CWE-1104

kiln/src/kiln/data/notifier/Kiln.app/Contents/MacOS/kiln-notifier

kiln-notifier

Why it matters. a compiled or binary member cannot be reviewed from source

Fix. ship source, or explain the binary in the README

MEDIUMInventory / provenance · inv.binary · CWE-1104

kiln/src/kiln/data/notifier/Kiln.app/Contents/Resources/Kiln.icns

Kiln.icns

Why it matters. a compiled or binary member cannot be reviewed from source

Fix. ship source, or explain the binary in the README

MEDIUMCode injection · code.dynamic_import · CWE-78, CWE-94, CWE-95

kiln/src/kiln/__init__.py:110

__import__(fqn)

MEDIUMCode injection · code.dynamic_import · CWE-78, CWE-94, CWE-95

kiln/src/kiln/__init__.py:114

__import__(fqn)

MEDIUMCode injection · code.dynamic_import · CWE-78, CWE-94, CWE-95

kiln/src/kiln/_pro_camera_bridge.py:124

camera_word = importlib.import_module(LOCAL_MODULE).camera_word

MEDIUMCode injection · code.dynamic_import · CWE-78, CWE-94, CWE-95

kiln/src/kiln/_pro_material_rules_bridge.py:42

check = importlib.import_module(LOCAL_MODULE).rule_check

MEDIUMCode injection · code.dynamic_import · CWE-78, CWE-94, CWE-95

kiln/src/kiln/generation/registry.py:104

mod = importlib.import_module(module_path)

MEDIUMInformation disclosure · disclose.log_secret · CWE-209, CWE-532

kiln/src/kiln/auth.py:348

logger.info("Revoked API key %r (id=%s)", api_key.name, key_id)

MEDIUMInformation disclosure · disclose.log_secret · CWE-209, CWE-532

kiln/src/kiln/auth.py:363

logger.info("Revoked API key %r (id=%s)", api_key.name, api_key.id)