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FabTally 3D-Print Slicer, Quote & DFM

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Analyze 3D model geometry

analyze_model

FREE geometry sanity check for an STL/3MF/OBJ/PLY model: bounding box (mm), volume (cm3), triangle count, watertight/manifold flag, fits-on-bed, plus a printable-so-far verdict and overhang/thin-wall heuristics. 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. Great pre-flight before get_print_quote. (See analyze_3d_model for a general, non-printing framing.)

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.
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.
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.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • 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. Changed4 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 / 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."
  3. Changed2 schema fields changed
    • addedInput schema / properties / material
      Added value: +{
+  "description": "Filament/material id (pla, pla-cf, petg, petg-cf, abs, abs-cf, asa, asa-cf, nylon, pc, pet, tpu). Default pla.",
+  "type": "string"
+}
    • removedInput schema / properties / x_payment
      Removed value: -{
-  "description": "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.",
-  "type": "string"
-}
  4. First observed

TDQS

A4.6/5.0
Behavior5/5

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

With no annotations, the description carries the full burden and does so well: it labels the call FREE, enumerates the heuristic outputs, and discloses non-obvious behaviors not present in structured data (zip handling uses 'first printable model inside', server fetch is blocked by certain marketplaces, MCP clients can silently truncate base64 payloads). This is behavioral context beyond the schema, not a restatement of it.

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

Conciseness4/5

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

Purpose and the output inventory are front-loaded, and every sentence is on-topic. It loses a point for redundancy: the long 'paste a link' passage repeats the model_url model description almost verbatim, so a chunk of the text does not earn new information.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

There is no output schema and no annotations, yet the description enumerates the return values, states the cost profile (FREE), covers the input-source edge cases and the base64 size limit, and routes to the right siblings. Nothing an agent needs to call it correctly is missing.

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 description coverage is 100%, so every parameter (printer, material, filename, model_url, model_base64) is already documented with enums, defaults, and formats. The description's URL/upload guidance largely duplicates the schema's own model_url and model_base64 text, adding little beyond the documented baseline.

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 with concrete outputs: 'geometry sanity check' returning bounding box (mm), volume (cm3), triangle count, watertight/manifold flag, fits-on-bed, and a printable verdict. It explicitly distinguishes itself from the near-identical sibling analyze_3d_model ('general, non-printing framing') so the agent can pick between the two.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives positive routing ('Great pre-flight before get_print_quote') and names the alternative with the condition that selects it ('See analyze_3d_model for a general, non-printing framing'). It also spells out the source-specific conditions (Thingiverse/Printables/MakerWorld block server downloads; local files must be uploaded first), covering how to invoke as well as when.

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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