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FabTally 3D-Print Slicer, Quote & DFM

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Optimize 3D-print orientation (least support)

optimize_orientation

FREE (personal/interactive; fair-use limited — counts as ~4 slices). Orientation optimiser: really slices up to 4 candidate build orientations with automatic supports and recommends the one using the LEAST support material (exact, slice-derived), with the filament/time saved vs printing as-is and an estimated price. Paste a link: a GitHub blob, Google Drive or Dropbox share link, a direct .stl/.3mf/.obj/.ply/.step URL, or a .zip (first printable model inside is used). Thingiverse/Printables/MakerWorld pages usually block server downloads: download the file yourself and upload it. Local file? Upload once at https://fabtally.com/upload and paste that URL. Reduces support waste, print time and post-processing. Agents / high volume: prepaid credits or the x402 agent lane.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
printerNoPrinter id from list_printers (elegoo-centauri-carbon, elegoo-neptune4-max, bambu-a1, bambu-a1-mini, bambu-p1s, bambu-x1c, prusa-mk4, prusa-mini, ender3-v3, creality-k1, creality-k1-max, voron-24-350, anycubic-kobra2). Default elegoo-centauri-carbon.
qualityNoQuality preset: draft 0.28mm | standard 0.20mm | fine 0.12mm layer height.
filenameNoFile name incl. extension, e.g. 'bracket.stl'. Required with model_base64.
materialNoFilament/material id (pla, pla-cf, petg, petg-cf, abs, abs-cf, asa, asa-cf, nylon, pc, pet, tpu). Default pla.
model_urlNoPREFERRED. Public URL to the 3D model. Paste a link: a GitHub blob, Google Drive or Dropbox share link, a direct .stl/.3mf/.obj/.ply/.step URL, or a .zip (first printable model inside is used). Thingiverse/Printables/MakerWorld pages usually block server downloads: download the file yourself and upload it. Local file? Upload once at https://fabtally.com/upload and paste that URL. The server fetches and (if a zip) unpacks it.
layer_heightNoExplicit layer height mm; overrides `quality`. 0.04 up to the printer's max (0.3-0.4 mm on a 0.4 mm nozzle).
model_base64NoBase64 model bytes — small-file fallback only (roughly <50KB). MCP clients (Claude/ChatGPT Desktop) truncate large inline tool arguments, so a real STL can silently arrive corrupted. For anything bigger use model_url (upload at https://fabtally.com/upload first). Provide `filename` too.
infill_percentNoSparse infill density percent (0-100).

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed5 schema fields changed
    • changedInput schema / properties / layer_height / description
      Previous value: -"Explicit layer height mm (0.04-0.6); overrides `quality`."New value: +"Explicit layer height mm; overrides `quality`. 0.04 up to the printer's max (0.3-0.4 mm on a 0.4 mm nozzle)."
    • addedInput schema / properties / layer_height / maximum
      Added value: +0.6
    • addedInput schema / properties / layer_height / minimum
      Added value: +0.04
    • changedInput schema / properties / model_url / description
      Previous value: -"PREFERRED. Public URL to the 3D model. Paste a link: Thingiverse/Printables/MakerWorld model pages, a GitHub blob, Google Drive or Dropbox share link, a direct .stl/.3mf/.obj/.ply/.step URL, or a .zip (first printable model inside is used). Local file? Upload once at https://fabtally.com/upload and paste that URL. The server fetches and (if a zip) unpacks it."New value: +"PREFERRED. Public URL to the 3D model. Paste a link: a GitHub blob, Google Drive or Dropbox share link, a direct .stl/.3mf/.obj/.ply/.step URL, or a .zip (first printable model inside is used). Thingiverse/Printables/MakerWorld pages usually block server downloads: download the file yourself and upload it. Local file? Upload once at https://fabtally.com/upload and paste that URL. The server fetches and (if a zip) unpacks it."
    • changedInput schema / properties / printer / description
      Previous value: -"Printer id from list_printers (elegoo-neptune4-max, bambu-a1, bambu-a1-mini, bambu-p1s, bambu-x1c, prusa-mk4, prusa-mini, ender3-v3, creality-k1, creality-k1-max, voron-24-350, anycubic-kobra2). Default elegoo-neptune4-max."New value: +"Printer id from list_printers (elegoo-centauri-carbon, elegoo-neptune4-max, bambu-a1, bambu-a1-mini, bambu-p1s, bambu-x1c, prusa-mk4, prusa-mini, ender3-v3, creality-k1, creality-k1-max, voron-24-350, anycubic-kobra2). Default elegoo-centauri-carbon."
  2. Changed8 schema fields changed
    • changedInput schema / properties / filename / description
      Previous value: -"File name incl. extension, e.g. 'bracket.stl'. Sets the file type; required with model_base64."New value: +"File name incl. extension, e.g. 'bracket.stl'. Required with model_base64."
    • changedInput schema / properties / infill_percent / description
      Previous value: -"Sparse infill density percent (0-100). Used for the material-saving delta in a full DFM report."New value: +"Sparse infill density percent (0-100)."
    • changedInput schema / properties / layer_height / description
      Previous value: -"Explicit layer height in mm (0.04-0.6); overrides `quality` if both are given."New value: +"Explicit layer height mm (0.04-0.6); overrides `quality`."
    • changedInput schema / properties / model_base64 / description
      Previous value: -"Base64-encoded model file bytes (STL/3MF/OBJ/PLY/STEP), an alternative to model_url for inline data. Provide `filename` too."New value: +"Base64 model bytes — small-file fallback only (roughly <50KB). MCP clients (Claude/ChatGPT Desktop) truncate large inline tool arguments, so a real STL can silently arrive corrupted. For anything bigger use model_url (upload at https://fabtally.com/upload first). Provide `filename` too."
    • changedInput schema / properties / model_url / description
      Previous value: -"Public https URL to the 3D model file (STL, 3MF, OBJ, PLY, or STEP). The server fetches it. Use this OR model_base64."New value: +"PREFERRED. Public URL to the 3D model. Paste a link: Thingiverse/Printables/MakerWorld model pages, a GitHub blob, Google Drive or Dropbox share link, a direct .stl/.3mf/.obj/.ply/.step URL, or a .zip (first printable model inside is used). Local file? Upload once at https://fabtally.com/upload and paste that URL. The server fetches and (if a zip) unpacks it."
    • changedInput schema / properties / printer / description
      Previous value: -"3D printer id from list_printers (elegoo-neptune4-max, bambu-a1, bambu-a1-mini, bambu-p1s, bambu-x1c, prusa-mk4, prusa-mini, ender3-v3, creality-k1, creality-k1-max, voron-24-350, anycubic-kobra2). Default elegoo-neptune4-max."New value: +"Printer id from list_printers (elegoo-neptune4-max, bambu-a1, bambu-a1-mini, bambu-p1s, bambu-x1c, prusa-mk4, prusa-mini, ender3-v3, creality-k1, creality-k1-max, voron-24-350, anycubic-kobra2). Default elegoo-neptune4-max."
    • changedInput schema / properties / quality / description
      Previous value: -"Print quality preset: draft 0.28mm | standard 0.20mm | fine 0.12mm layer height."New value: +"Quality preset: draft 0.28mm | standard 0.20mm | fine 0.12mm layer height."
    • removedInput schema / properties / x_payment
      Removed value: -{
-  "description": "x402 payment payload (base64) for a PAID tool/mode. If supplied it is forwarded as the X-PAYMENT header to settle the call and return the real result instead of a 402 challenge. Omit to get the price challenge first.",
-  "type": "string"
-}
  3. Changed1 schema field changed
    • changedInput schema / properties / x_payment / description
      Previous value: -"x402 payment payload (base64) for a PAID tool. If supplied it is forwarded as the X-PAYMENT header to settle the call and return the real result instead of a 402 challenge. Omit to get the price challenge first."New value: +"x402 payment payload (base64) for a PAID tool/mode. If supplied it is forwarded as the X-PAYMENT header to settle the call and return the real result instead of a 402 challenge. Omit to get the price challenge first."
  4. First observed

TDQS

A4/5.0
Behavior4/5

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

With no annotations, the description carries the full burden and does add real behavioral context: free personal/interactive tier with a fair-use cap counting as ~4 slices, a 4-candidate slicing run, exact slice-derived results, filament/time savings and an estimated price, plus prepaid credits/x402 for agents. It omits runtime duration, rate-limit specifics, and error/retry behavior for a server-side fetch-and-slice job.

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

Conciseness3/5

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

The first line leads with pricing/quota rather than the purpose, and the text repeats the model_url paste-a-link guidance that already appears in the schema, plus filler like 'Reduces support waste, print time and post-processing.' The purpose is still reachable in sentence two, but there is redundancy that dilutes front-loading.

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?

With no output schema and no annotations, the description supplies the key return context (chosen orientation, filament/time saved, estimated price) and the cost model. It is nearly complete for an 8-param, zero-required analysis tool, missing only failure/timeout behavior and any note that all params are optional defaults.

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 100% with 8 well-documented params, so the schema already defines printer, quality, material, infill and the model_url/base64 options. The description mostly repeats the model_url guidance verbatim rather than adding new semantics; baseline 3 is appropriate.

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 (orientation optimiser) and a precise mechanism: it really slices up to 4 candidate build orientations with automatic supports and recommends the one using the LEAST support material. This is clearly distinguishable from siblings like slice_model, check_printability and recommend_settings, which the description implicitly does not overlap.

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?

Gives clear context: use it to reduce support waste, print time and post-processing, with fair-use limits (~4 slices) and an agent lane for high volume. However it never names a sibling or states a when-not-to-use condition versus slice_model/check_printability, so routing is left partly to inference.

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

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