Orcaslicer MCP

Authoritative definition of one OrcaSlicer setting: label, tooltip, type, unit, valid range, enum values, and default. Read-only and offline, so it works even when OrcaSlicer is not running. Use it to learn a setting's exact type and allowed values before writing it with set_config or edit_preset. To find candidate keys by keyword first, use search_settings.

One-call plate diagnosis: app/slice status, objects on the plate, bed + active skirt/brim/clearance settings, and the last slice's warnings, so you don't have to chain status->objects->config. Start here for 'why won't this slice / fit'. Slice warnings are only as complete as the fork exposes today (see get_slice_warnings). For a 'does it fit the bed' estimate, pair with check_placement.

Duplicate an object on the plate by id (adds a copy, offset from the original).

Edit a named preset's settings and persist them: selects it, applies the changes atomically, saves under the same name. Runs the check_profile_physics gate first (F15) and refuses with error=physics_blocked if the changes would INTRODUCE a failing physics check (pre-existing failures do not block unrelated edits). For type='filament', checks that also depend on the currently selected PRINT preset (flow_ceiling, temp_vs_flow) do not block; they come back as cross_layer_warnings, because a filament preset pairs with many print presets.

Find config keys containing `substring` (helps discover among the ~600 keys).

Read merged config values (optionally filtered to `keys`).

Retrieve the last successful slice's G-code as text.

Whether the plate's background job worker is idle or still running. Read-only. arrange_plate and auto_orient start async jobs; poll this until it reports idle before you read object positions or slice, so you act on the settled layout rather than a mid-move state.

Read the full settings of a named preset without selecting it. type = print|filament|printer.

What the 3D printer is doing right now: state (idle, heating, printing, paused, finished, cancelled, error, shutdown, offline), nozzle and bed temperatures with their targets, the current job (file, progress, layer, time elapsed and left, and what the time left is based on), and any problems the printer reports, each in the printer's own words with a plain-English hint for common ones. Relay `headline` as-is. Never invent a cause the printer did not report. Finds the printer from OrcaSlicer's active printer profile (or ORCA_PRINTER_URL), so it needs no extra setup once the printer is connecte…

Per-feature breakdown of the last slice + a stateless predicted-vs-observed flow check. Returns per-role time/filament + speed/flow ranges, global time-weighted metric distributions, per-layer aggregates, and a prediction_check flagging where the profile's speed was silently throttled at the flow ceiling ('clamped'). Answers 'which feature is the time hog' directly instead of by trial slicing. Degrades to {"available": false, "reason": ...} on fork builds that don't emit the breakdown, or when there is no valid slice.

State of the current or most recent slice: state (slicing, done, error, or idle), stats (print time and filament use when done), and any warnings or errors. Read-only. Poll this after slice to follow progress and read the result; 'idle' means no slice has run or it was cancelled. For only the pass/fail warnings use get_slice_warnings; for a per-feature time and filament breakdown use get_slice_breakdown.

Just the warnings/errors from the last (or current) slice, plus validity: the fast 'did anything go wrong' check and the way to confirm a fix cleared. NOTE: only as complete as the API exposes. On the current fork build this may report valid with an empty warnings list even when the GUI shows a plate-boundary toast - the fork must populate the plater warning list (tracked as the fork batch). Once it does, this reports the real warnings with no change here.

Snapshot of the current OrcaSlicer session: app and project info, the active print/filament/printer presets with which of their keys are modified (dirty), whether the last slice is still valid, and whether a slice is running. Read-only. Call it first to orient before slicing or editing, to see which settings drift from their preset, or to check slice_result_valid before trusting earlier stats.

List objects in the project: id (stable), name, size_mm, transform (offset/rotation/scale) and, on fork v2.4.2-mcp.13 and later, the 0-based plate each one sits on (-1 when it is off every plate).

List the plates in the project: each one's 0-based index, name, whether it is the current plate (the one slice, get_gcode, render_plate and get_job_status act on), lock state, build volume and the objects it holds. Also says how many plates the build allows (max) and whether one can be added or deleted right now. Read-only. Plate numbers shown in the OrcaSlicer window are 1-based; every tool here takes the 0-based index from this list. Needs fork v2.4.2-mcp.13 or later.

List print/filament/printer presets with system/selected/visible flags. F12: by default returns only USER presets plus whatever is currently SELECTED - the built-in system presets are ~400 entries of noise. Pass include_system=True for the full list, and/or type='print'|'filament'|'printer' to restrict to one category. `hidden_system` reports how many system presets were filtered out.

How did recent prints on the printer actually end? For each finished job: result (success, cancelled or error), how long it took against the slicer's estimate, filament used, and for failed or stopped jobs the printer's own reason while its console still holds it. `summary` says how the slicer's time estimates compare with reality once there are a few finished prints. Also copies those jobs into the local outcome store (safe to repeat), so recall_prints can learn from them. Klipper printers only. `limit` is capped at 50.

Load a model file (path on the OrcaSlicer host) onto the current plate. Accepts .stl/.obj/.3mf, plus .step/.stp on fork v2.3.2-mcp.3+. Large STEP files can take a minute to tessellate; the call waits.

Move an object onto another plate. Coming from a plate it keeps its position relative to that plate (front-left of plate 1 lands front-left of plate 2); coming from off-plate (parked beside the bed) it lands at the destination's centre. If it then overlaps a part, shift it with transform_object; arrange_plate would re-pack every plate together. list_objects reports each object's plate (-1 when off every plate). Moving leaves both plates' slices invalid, so re-slice. An object already on that plate is left where it is (moved: false); a locked plate at either end refuses the move (plate_locked)…

How did past prints of THIS model actually turn out? Matches the current plate by geometry (or by model_name if given / the slicer is offline), returning each past print's result (success/cancelled/error), your recorded verdict (e.g. 'warped'), and the settings it was sliced with. Call this BEFORE slicing and tell the user anything relevant (a past warp, a failed layer height). Each row also carries failure_reason (the printer's own words, when known) and the slicer's estimates (est_time_s, est_filament_g). duration_s is Moonraker's whole job time, including heating up and any pauses, so besid…

Persist a context fact for future sessions. scope: 'machine:<printer>/<filament>', 'user', or 'project:<name>'. Local plain files; user-readable and deletable.

Rename a user preset by copying it to new_name, selecting the copy, and deleting the original. Only user presets can be renamed; system presets are read-only. Because it selects the renamed preset, this leaves it active and discards unsaved config overrides, the same as select_preset, and leaves the last slice invalid, so re-slice afterwards.

Render a PNG picture of the current plate so you can SEE it. view="editor": the models on the bed BEFORE slicing - use to check orientation, plate contact, and first-layer footprint (an Euler triple is near-unreadable; this is the ground truth). view="preview": the sliced toolpaths colored by feature role AFTER a successful slice - support is visibly distinct, so use it to check where support actually went. angle: iso|top|front|left|right|rear|bottom. frame: "plate" zooms out to the whole bed (where the part sits, footprint), "object" zooms in on the model/toolpaths (detail). Defaults to "pla…

Save the last successful slice's G-code and record the slice (model, a fingerprint of the objects' names and sizes, full settings snapshot, and OrcaSlicer's time and filament estimates) in the local outcome store under that filename. When that file is printed, list_print_history (or klipper-mcp's recorder) matches the finished job by filename, so the real result joins back to these settings. Returns the saved path; hand it to klipper-mcp's start_print. Default filename: <object>_<timestamp>.gcode. Never overwrites an existing file: a name collision gets a -2, -3, ... suffix. Writes into a gcod…

Save the currently edited settings as a named user preset (create or update, visible in the GUI immediately). type = print|filament|printer. detach=True saves it standalone instead of inheriting the current base preset; use it when creating a filament preset for a DIFFERENT material than the one selected, otherwise the new preset inherits the base's filament_type and temperatures. Run check_profile_physics first; do not save when verdict=blocked.

Search settings by keyword across key/label/tooltip; returns compact matches (key, label, category, short tooltip), ranked key/label first. Offline.

Make a plate the current one, exactly like clicking it: slice_and_wait, get_gcode, render_plate, get_slice_status and get_job_status then act on that plate. get_slice_status then reports that plate's own result: its stats if it is still sliced, otherwise idle with "plate N is not sliced". Switching plates leaves unsaved config overrides alone; it changes only which plate is sliced. Selecting the plate that is already current is a no-op.

Make the named preset the active one for its group (print, filament, or printer). Discards unsaved overrides in EVERY preset group, not just the one being switched: a filament switch also drops unsaved print and printer edits, including ones made by hand in the OrcaSlicer window. That is deliberate (OrcaSlicer consults the other groups when switching, and any unsaved one would open a modal dialog nothing can dismiss remotely), so call save_preset first if any unsaved edit should survive. Newer slicer builds report which groups were affected as 'discarded_changes' in the reply. This also make…

Apply config changes to the active project as unsaved overrides, atomically: if any key is invalid the whole batch is rejected and nothing changes. Returns {applied, errors}. Overrides show as modified in get_status, are not written to any preset file, and revert if the preset is reselected; call save_preset to persist them. Each apply invalidates the last slice, so re-slice afterwards. It does not run the physics gate, so for temperature, speed, acceleration, or flow keys run check_profile_physics before trusting the result. To edit a stored preset rather than the live project, use edit_pres…

Override the layer height over a Z band of one object (e.g. 0 to 5 mm printed at 0.1 mm for finer detail near the base). Passing the same min_z and max_z again updates that band's height; clear=True removes every band on the object. Bands are per-object and invalidate the last slice, so re-slice afterwards. For a single height across the whole object use set_layer_height instead. Get the id from list_objects.

Variable layer height for one object. mode='adaptive' (quality 0..1, higher = finer detail) generates an adaptive profile; mode='reset' (aliases: 'default', 'none') restores uniform layers.

Set per-object config overrides on an object by id, e.g. {"wall_loops": 4, "sparse_infill_density": "30%"}. Atomic (nothing applied if any key is invalid).

Start slicing the current plate in the background and return immediately, without waiting for the result. The reply is 'started' (a slice began), 'already_valid' (the plate is unchanged and the last result still holds), or a conflict if a slice is already running. Fire-and-forget: poll get_slice_status for progress and stats, or cancel_slice to stop it. Prefer slice_and_wait when you want the finished stats back in one call.

Slice the current plate and block until it finishes, then return the final stats and warnings in one call. If the plate is already sliced and unchanged, it returns the existing result without re-slicing. This is the usual way to slice when you want the outcome immediately. For a non-blocking start, use slice then poll get_slice_status; to sweep one setting across values, use compare_settings.

Move/rotate/scale an object by id. translate=[dx,dy,dz] mm (relative), rotate=[rx,ry,rz] degrees (relative), scale=[sx,sy,sz] absolute factor. Provide at least one. On fork v2.4.2-mcp.13 and later the object then belongs to whichever plate it sits on, as after a drag in the window; list_objects shows the plate. To send an object to another plate, move_object_to_plate is simpler than working out coordinates.

Wait until the printer reaches a point in a print, checking every 5 seconds. Returns as soon as it happens (met: true), or at the timeout with the latest status (met: false). It also returns early, with stopped_early saying why, when the printer reports a fault, when the job ends before the point it waits for (a cancelled print, say), or after losing contact ("Lost contact with the printer"). A job that completes successfully while the wait is for 'printing' or 'first_layer_done' counts as met (a one-layer print passes both at once). A met result can carry stopped_early too, for example a job …

Collect live events (slice.*/config.changed/project.opened) over a bounded window.