--- title: "Use SpeakCAD from ChatGPT, Claude and other AI assistants" description: "Add the SpeakCAD connector (MCP) to ChatGPT or Claude and sign in: SpeakCAD's own AI designs your part from the chat, shows it in 3D there, and gives the STL, 3MF or G-code, on your account's credits." canonical: https://speakcad.com/guides/speakcad-in-chatgpt-and-claude published: 2026-09-18 updated: 2026-10-01 publisher: SpeakCAD --- # Use SpeakCAD from ChatGPT, Claude and other AI assistants > Add the SpeakCAD connector (MCP) to ChatGPT or Claude and sign in: SpeakCAD's own AI designs your part from the chat, shows it in 3D there, and gives the STL, 3MF or G-code, on your account's credits. Assistants are good at understanding what you need and bad at producing a file that prints. The SpeakCAD connector splits the work: the assistant gathers the measurements, SpeakCAD's own AI builds the dimensioned model in your SpeakCAD account, and you get the STL, 3MF or G-code for your printer without leaving the conversation. The part stays in your models, one click from the full editor. ## Steps 1. **Add the connector.** The SpeakCAD MCP server is at https://speakcad.com/api/mcp. In Claude: Customize, Connectors, +, Add custom connector, paste the address. In ChatGPT: turn on Developer mode in Settings, Security and login, then press + on the Plugins page and paste the address, with OAuth. Any other MCP client works the same way, with the Streamable HTTP transport and OAuth. 2. **Sign in with your SpeakCAD account.** The assistant opens SpeakCAD's sign-in page and asks you to allow it. Everything it does is saved in your account and paid with your credits, exactly as on the site. You can disconnect it at any time from the assistant's connector settings. 3. **Describe the part.** Say what you need with its measurements: a case for a Raspberry Pi 5 with a fan cutout, a hook for a 40 mm pipe. The assistant checks the SpeakCAD catalogue first, then has SpeakCAD design the part; it usually takes two to five minutes and, in Claude, appears in 3D in the chat. 4. **Adjust it.** Type new dimensions in the viewer (free, saved as a new version) or ask for a change in words, in the chat or in the viewer (2 credits for a small change, the first 3 of each part free on a plan, 3 for a design change, included in Unlimited). 5. **Download or slice.** Download STL or 3MF (included in every plan; 4 credits without one, with small fixes of a paid design re-downloading free), or G-code sliced for your printer (at the price of the STL). For click-to-select edits, every version and Fit Check, open the part in the SpeakCAD editor. Setting it up, click by click: [SpeakCAD in ChatGPT](/guides/speakcad-in-chatgpt) and [SpeakCAD in Claude](/guides/speakcad-in-claude). This page is the overview; [SpeakCAD for ChatGPT](/chatgpt-plugin), [SpeakCAD for Claude](/claude-connector) and [the MCP server](/mcp-server) sum up what each one does and costs, with the set-up for Claude Code, Cursor and VS Code. ## What the connector does MCP (Model Context Protocol) is the standard ChatGPT, Claude and other assistants use to talk to outside tools. The SpeakCAD server gives the assistant these, all on your signed-in account: - **search_models** and **get_model** look through the library of generate-to-fit parts and the maker marketplace; in Claude a ready-made model shows in 3D. - **create_part** has SpeakCAD's AI design a new part from the description and measurements, as a new model in your account. It is the same AI, the same model routing and the same design rules as the editor on the site. - **edit_part** changes it in words, one change at a time, each a new version; **get_part** reads where it stands, its size and its named dimensions. - **edit_file** changes your own STL or 3MF: a file cannot go through the chat, so the SpeakCAD card opens in the conversation, you drop the file on it and type the change, and SpeakCAD's AI changes it in your account (a request's credits); after that it is a part like any other for edit_part, the downloads and the slicer. - **download_part** gives an STL or 3MF link, priced as a download on the site (included in every plan). - **find_printer** and **prepare_slice** pick your printer among 380+ from 60+ brands and the print settings, checked against its OrcaSlicer profile; the part (or a file you drop) is sliced in the conversation and the G-code comes back as a link. - **get_account** and **get_pricing** tell the assistant what you have left and what things cost, so it quotes the right price. The slicer tools also come on their own, as the **SpeakCAD Slicer** connector at https://speakcad.com/api/mcp/slicer, listed in Claude's connectors directory: see [slice from ChatGPT or Claude](/guides/slice-from-chatgpt-or-claude). ## Inside Claude: the part in the conversation Claude renders interactive tools, and SpeakCAD uses that: the part appears in the chat in 3D while SpeakCAD designs it, then with its dimensions as number fields. Change a number and apply it (free, a new version), type a change in words, download the STL or 3MF, or slice it for your printer and download the G-code, all in the card. The assistant is told the result, so you can keep talking about it. The **Open in SpeakCAD** button opens the same part in the full editor. ## Why the editor is still one click away The chat is the quickest way to a first version. The editor is where a part gets right: you click the face or the hole you mean and describe the change, every version is kept and can be restored, and Fit Check prints a five-minute test piece that calibrates the clearances to your own printer. Everything made from the chat is already in your models there. ## What it costs Exactly what it costs on the site, from the same balance: 4 credits per new part on a plan, its first 3 small changes free (3 without a plan), 3 per design change (2 for a small change, 1 for a quick tweak such as a changed number), downloads included in every plan (4 credits without one), and G-code at the price of the STL. A plan pays for it, from Maker at $7.99 a month; Unlimited includes the requests. Typing new dimensions and looking at the part in 3D spend nothing. Adding the connector is free; it needs a SpeakCAD account to sign in. ## No connector? Paste the description The connector is a convenience, not a requirement. When the assistant has already written the part (the sizes, the holes, the lid) copy that text, open SpeakCAD and paste it into the chat: the numbers are used exactly. The [ChatGPT to STL page](/chatgpt-to-stl) shows what to keep from the conversation and what comes out. ## Why not let the assistant write the model itself Assistants will happily write OpenSCAD or describe a shape, and the result usually needs a CAD tool, a fix for a non-manifold mesh, and a slicer. SpeakCAD compiles the model in the browser, applies FDM design rules (wall thickness, clearances, a flat base), shows it in 3D, and exports a watertight file, or G-code for your exact printer. The assistant is the front door; the editor is where the part gets right. ## Good requests Give measurements in millimetres and say what the part mates with: "an enclosure for a 70 x 50 mm PCB with four M3 holes on a 62 x 42 mm pattern, a USB-C cutout on the short side, 2 mm walls and a snap-fit lid". The assistant passes all of it along, and the numbers are used exactly. ## Invite a friend while you are at it Every SpeakCAD account has an invitation link on its plan page. A friend who subscribes from it gets extra credits, and so do you, more on a higher plan. ## About SpeakCAD SpeakCAD is the most intuitive CAD for 3D printing, made for people who own a 3D printer and need a part that fits something they have: tap a face and type a size to shape it with simple tools, or describe it to the AI, on your phone or computer, and download a print-ready STL, 3MF or G-code sliced for your printer. SpeakCAD works inside ChatGPT and Claude as a plugin (an MCP server): ask the assistant for a part with its measurements and SpeakCAD's own CAD AI designs it, shows it in 3D in the chat and hands over a print-ready STL, 3MF or G-code sliced for your printer. - Live demo, no account: https://speakcad.com/demo - In ChatGPT, Claude and other MCP clients: https://speakcad.com/chatgpt-plugin, https://speakcad.com/claude-connector, https://speakcad.com/mcp-server - Pricing: https://speakcad.com/pricing - FAQ: https://speakcad.com/faq - Site index for AI assistants: https://speakcad.com/llms.txt