OwlCAD

com.owlcadPublished by owlcad.comOfficial publisherv1.0.1Updated Oct 24, 2026

Parametric 3D CAD for AI agents: build print-ready parts, check them, export STL, 3MF or STEP.

VerifiedStreamable HTTPWeb executableDeveloper ToolsMedia & Design

Overview

AI-generated overview

OwlCAD is a hosted MCP server that lets an assistant build parametric, millimeter-dimensioned 3D parts, check printability, and export STL, 3MF, OBJ or STEP…

What you can do
  • Build parts from primitives, booleans, generators (gears, threads, Gridfinity bins and baseplates) and a library of datasheet-dimensioned parts
  • Check models for watertightness, size, volume, overhangs, thinnest wall, collisions and printer-bed fit, and split oversized parts into printable pieces
  • Export STL, 3MF or OBJ for slicers, STEP for other CAD tools, or a 2D drawing
  • List, read, edit, organize, share and delete saved OwlCAD projects
When to use it
Useful when you want an assistant to turn a plain-language description into a printable part, verify it will print, and hand back a file or an editable project link. Suited to 3D printing and CAD work where dimensions stay editable afterwards in the browser editor.
Requirements
A remote Streamable HTTP endpoint at mcp.owlcad.com; nothing runs locally. An OwlCAD account on the Pro plan is required, and OAuth sign-in with a browser approval on first use. Works with Claude, GitHub Copilot in VS Code, Claude Code, Cursor, Gemini CLI and other Streamable HTTP clients.
Before you install
Requires a paid Pro subscription. Each tool call sends the model or project being worked on to OwlCAD's hosted server, which reads and writes projects in your account. The assistant can share and delete saved projects, so review destructive actions. Access can be revoked from Account settings.

Installation

In SourceWeft

  1. Open OwlCAD in the dashboard and add it to a workspace.
  2. Connect the required credentials. They are stored privately and never shown on public pages.
  3. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/com.owlcad%2Fmcp/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config. The client completes OAuth sign-in on first connect.

{
  "mcpServers": {
    "owlcad": {
      "type": "http",
      "url": "https://mcp.owlcad.com/"
    }
  }
}

README

OwlCAD

Parametric 3D CAD for 3D printing, for your AI assistant. This plugin connects Claude, GitHub Copilot in VS Code, Cursor or Gemini CLI to OwlCAD's hosted MCP server, so the assistant can build millimeter-dimensioned parts, check that they will print, and export STL, 3MF or STEP. Everything it makes is a normal OwlCAD project: a tree of named, dimensioned parts you can open in the browser editor at owlcad.com and change afterwards.

What it can do

  • Build parts from primitives and booleans, built-in generators (gears, threads, Gridfinity bins and baseplates) and a library of datasheet-dimensioned parts.
  • Check them: watertight build, size and volume, overhangs, thinnest wall, collisions between parts, and whether a part fits a given printer's bed. It can also cut an oversized part into printable pieces.
  • Export STL, 3MF or OBJ for a slicer, STEP for other CAD tools, or a 2D drawing.
  • List, read, edit, organize, share and delete your saved OwlCAD projects.

29 tools in all. The full list, with what each one does, is at owlcad.com/mcp-server.

Requirements

An OwlCAD account on the Pro plan. The first time the assistant uses OwlCAD, a browser opens so you can sign in and approve what it may do. You can revoke the connection at any time from Account settings on owlcad.com.

What it runs, sends and fetches

This plugin contains configuration only. It runs nothing on your machine. It points your assistant at https://mcp.owlcad.com/, OwlCAD's hosted server. Each tool call sends that server the model or project the assistant is working on, and the server reads and writes projects in your OwlCAD account. How that data is handled is described in the privacy policy.

Install

The server is https://mcp.owlcad.com/ (Streamable HTTP). It signs you in with OAuth, so there is no API key to copy.

  • Claude (web, desktop): open OwlCAD in Claude's directory and select Connect. Or add it by URL: Settings → Connectors → Add custom connector, and paste https://mcp.owlcad.com/.

  • GitHub Copilot in VS Code: run MCP: Add Server from the Command Palette, choose HTTP and enter https://mcp.owlcad.com/, or add it to .vscode/mcp.json, then sign in when VS Code asks:

    json
    { "servers": { "owlcad": { "type": "http", "url": "https://mcp.owlcad.com/" } } }

  • Claude Code: claude mcp add --transport http owlcad https://mcp.owlcad.com/

  • Cursor: add the server to ~/.cursor/mcp.json (or a project's .cursor/mcp.json), then sign in when Cursor asks:

    json
    { "mcpServers": { "owlcad": { "url": "https://mcp.owlcad.com/" } } }

  • Gemini CLI: gemini extensions install https://github.com/Spare-Matter/owlcad-plugin

Other MCP clients that speak Streamable HTTP work the same way: point them at the URL and sign in.

Using it

Ask in plain language. For example:

  • "Design a 60 mm wall hook with two screw holes and check that it prints."
  • "Make a 2 by 3 Gridfinity bin, 6 units tall, and save it to OwlCAD."
  • "Make a 20-tooth and a 40-tooth spur gear that mesh, check they don't collide, and export a STEP."
  • "Export my latest OwlCAD project as a 3MF."

The assistant builds the model with OwlCAD's tools, checks it, and gives you a file or a link that opens the project in the editor, where every dimension can still be changed. Units are millimeters and Z points up.

Support

owlcad.com/contact · [email protected]

License

The files in this repository (configuration and documentation) are MIT-licensed; see LICENSE. The OwlCAD service they connect to is proprietary.

Source: README.md at commit bddc228

Tools

0
This server asks you to sign in, so SourceWeft could not read its tools without an account and has not indexed them. What a connected account sees can depend on that account and its permissions.

Version history

2
  1. v1.0.1LatestOct 15, 2026
  2. v1.0.0Sep 16, 2026

Score

85% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts