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stlToSolid

by Crypto69version 0.6.1i★ –iRuns on your computer
Registry nameio.github.Crypto69/stltosolid

Install

Overview

Description from the maker (original English)

Turn STL and OBJ meshes and dimensioned drawings into real CAD solids and Fusion 360 scripts.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

  • Connection: Runs on your computer
  • Transport: stdio
  • Category: Other

Install

Pick the AI app you use, then copy the settings.

Before you install

  • Basic checks: 1 of 1 passed
  • Runs on your computer with your user’s permissions (files, network, apps).
  • You fill in yourself: STLTOSOLID_OUT, STLTOSOLID_MCP_ALLOW_CODE

You need

  • PyPIPython’s uv installed (for the uvx command)

Which app do you use?

Pick your app above. We remember it, so next time the button says “Install in …”.

Download the maker’s .mcpb file

The link goes to the maker’s own file; we do not host or repackage it. Open the file and Claude Desktop installs it.

Run this in your terminal

claude mcp add stltosolid --env STLTOSOLID_OUT=your-value --env STLTOSOLID_MCP_ALLOW_CODE=your-value -- uvx stltosolid mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "stltosolid": {
      "command": "uvx",
      "args": [
        "stltosolid",
        "mcp"
      ],
      "env": {
        "STLTOSOLID_OUT": "your-value",
        "STLTOSOLID_MCP_ALLOW_CODE": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "stltosolid": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "stltosolid",
        "mcp"
      ],
      "env": {
        "STLTOSOLID_OUT": "your-value",
        "STLTOSOLID_MCP_ALLOW_CODE": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

  • STLTOSOLID_OUT env
    Folder for results (default ~/stlToSolid/mcp-output)
  • STLTOSOLID_MCP_ALLOW_CODE env
    Set to 1 to enable build_cadquery, which runs model-written CadQuery under an allow-list

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

  • ✓ Pass

    Maker matches the repo

    The registry name was verified with the GitHub account Crypto69, which owns the repo

  • … Not checked yet

    Still maintained

    We have not read this repo from GitHub yet

  • … Not checked yet

    Has a licence

    We have not read this repo from GitHub yet

  • – Not applicable

    Endpoint responds

    This one runs on your computer; there is no internet endpoint

  • – Not applicable

    Sign-in with OAuth

    Runs on your computer and uses local settings instead

  • … Not checked yet

    No hidden instructions in tool descriptions

    Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

  • More stars than 0% of the other 32686 servers in this category
  • Published to the registry more recently than 87% of the other 32686 servers in this category
  • Basic checks equal to or better than 100% of the other 32686 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is stlToSolid safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.6.1) reached the registry 5 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv), MCPB on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Microsoft Exchange Online MCP

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.

Runs on your computer★ 440MITUpdated 14 months ago
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Remote Desktop Commander

by desktop-commander

Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

Runs in the cloud★ 211Updated 2 days ago
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Exchange Online admin for MSPs: forwarding audits, EWS posture and offboarding, no PowerShell

Runs on your computerUpdated today
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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

stlToSolid

Turn an STL or OBJ mesh into a real solid you can model against in Fusion 360.

[User manual](https://github.com/Crypto69/stlToSolid/blob/main/docs/manual/stlToSolid-User-Manual.md): how to use each tool and what every setting does, with screenshots. Also as a PDF and on the website at stltosolid.com/docs.

Why

I design 3D-printed parts as a hobby, and I kept needing to model *around* a mesh: a bracket from Thingiverse, a scanned housing, a controller shell. Fusion 360's free tier turns a mesh into a solid made of thousands of little triangles. You can't sketch on it, measure it or build on it.

stlToSolid gives you flat faces, round holes and smooth curves instead, so the part behaves like something you modelled yourself.

Before and after

The same servo_bracket_1.stl, opened in Fusion 360 three ways. Left: Fusion's own *Mesh → Solid* (every triangle becomes a face). Middle: the STL mesh as loaded. Right: the STEP from stlToSolid, with 23 faces, planes and cylinders, and holes that are real holes.

*Fusion Mesh → Solid, zoomed in: one face per triangle, so the "solid" carries all 1,644 facets and cannot be sketched on, filleted or measured like a modelled part.**stlToSolid, zoomed in: flat faces are single planes, the blend is one cylinder, the edges are where the design has them.*
In the app
*Mesh loaded, with units and quality limits.**Servo bracket: 1,644 triangles → 23 faces (15 planes, 8 cylinders), max deviation 0.060 mm.*
*Frame with countersinks: 4,200 triangles → 101 faces, max deviation 0.040 mm.**Joystick claw: 1,902 triangles → 250 faces, including 43 cylinders and 20 spheres.*

The four tools

  • Mesh → Solid. Drop in a mesh and get a STEP file with real planes, cylinders, cones and fillets. Simple parts also come with a Fusion script that rebuilds them as editable sketches and extrudes.
  • Sliced Loft. For smooth, rounded shapes like caps, handles and shells. It slices the mesh into outlines and lofts them into one smooth solid.
  • X-Ray. Traces a stack of outlines between two planes and gives you a Fusion script with one sketch per slice. It can also extrude the slices into a stepped solid.
  • Blueprint. Starts from a picture, not a mesh. Drop in a dimensioned drawing, and an AI model of your choice reads the numbers and builds a parametric Fusion script and a STEP. You can fix any number it misread. It then looks at its own build from four sides and corrects what differs from the drawing; a part with bends, blends or tilted bosses, which the parametric recipe cannot draw, it writes as a short CadQuery script instead (STEP only).

Results open in Fusion 360 (or any CAD program that reads STEP).

There is also a Fusion 360 add-in, [Mesh to Outline](https://github.com/Crypto69/mesh-to-outline), that does the X-Ray tracing inside Fusion itself. The user manual has a step-by-step guide for every tool, the add-in included.

Get it

Mac (Apple Silicon)Download the app from Releases. No Python or Docker needed.
Windows (64-bit)Download from Releases. Unzip and open.
Your NAS or a serverOne Docker container you open from any browser: docker compose up --build, then go to http://localhost:8321. Step-by-step NAS guide: docs/DEPLOY-NAS.md.
Command linepip install stltosolid then stltosolid part.stl makes part.step.
An AI assistantClaude, Cursor or any MCP client can drive every tool. See below.

The Mac and Windows apps are the same app as the web version, in their own window.

Running a Fusion script

Some results come with a .py script for Fusion 360. To run one:

  1. Put the .py file in an empty folder.
  2. In Fusion: Utilities → Add-Ins → Scripts and Add-Ins → +, and pick that folder.
  3. Press Run.

Use it from an AI assistant

stlToSolid is also an MCP server. An assistant can look at a mesh, convert it, read the report, slice it, and build a part from a drawing it reads itself. Everything runs on your computer. Nothing is uploaded, and no API key is needed.

claude mcp add stltosolid -- uvx --python 3.12 --from "stltosolid[mcp]" stltosolid-mcp

For Claude Desktop, Cursor and others, put this in the client's MCP settings:

{

"mcpServers": { "stltosolid": { "command": "uvx", "args": ["--python", "3.12", "--from", "stltosolid[mcp]", "stltosolid-mcp"] } } }

You need uv. The first start downloads the geometry kernel, about 2.8 GB, so run this once in a terminal first. It installs everything and tests it. Later starts take under a second.

uvx --python 3.12 --from "stltosolid[mcp]" stltosolid-mcp --check

Results go to ~/stlToSolid/mcp-output, and nothing is ever overwritten. The user manual lists the tools, the one-click Claude Desktop bundle and the remote mode for a NAS.

More detail

Using the app: the user manual (PDF) walks through every tool and every setting.

How it works inside: how each tool works, every setting, the API, measured results and the version history are in docs/TECHNICAL.md.

Licence

PolyForm Noncommercial 1.0.0. See LICENSE. Free for personal, hobby, educational and research use. Commercial use needs the author's permission, so get in touch.

Third-party parts keep their own licences (CadQuery Apache-2.0, OpenCascade LGPL-2.1 with exception, trimesh MIT, shapely/networkx BSD). The optional scan extra installs pymeshlab, which is GPL-3.0. It is not part of this package's licence and is only installed if you ask for it.

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