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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: 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. 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-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.
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: 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.
layer_heightNoExplicit layer height mm (0.04-0.6); overrides `quality`.
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. 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"
-}
  2. 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."
  3. 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 provided, the description carries the full burden. It thoroughly discloses behavioral traits: free tier with fair-use limit counting as ~4 slices, actual slicing of up to 4 orientations with automatic supports, exact support material measurement, and output of filament/time saved plus estimated price. It also explains input handling (zip → first printable model, base64 truncation fallback) and the upload workflow, providing rich context beyond the schema.

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

Conciseness5/5

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

The description is dense but every sentence earns its place: cost/limitations, core function, input formats, fallback path, benefits, and enterprise use. It is front-loaded with the most critical info (cost and purpose). No fluff or redundancy.

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?

Given there is no output schema, the description compensates by summarizing the output: recommendation, support material, filament/time saved, and estimated price. It covers input types, fallback, and cost. Minor gaps remain (e.g., error handling, max URL size limits) but overall it is sufficiently complete for a tool of this complexity.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so baseline is 3. The description adds extra meaning for model_url and model_base64 by explaining the upload flow, zip handling, and base64 truncation risks for MCP clients. It also clarifies that layer_height overrides quality. This exceeds the schema's descriptions, earning a 4.

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?

The description clearly states the tool is an 'Orientation optimiser' that 'slices up to 4 candidate build orientations' and 'recommends the one using the LEAST support material (exact, slice-derived)'. This is a specific verb+resource with a clear scope, and it distinguishes itself from sibling tools like slice_model or check_printability by focusing on orientation optimization.

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?

The description implies the use case: reduce support waste, print time, and post-processing. It also mentions fair-use limits and the x402 agent lane for high volume. However, it does not explicitly contrast with alternatives like slice_model or list when not to use it, so it stops short of full exclusion guidance.

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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