Design 3D printable parts in Claude, with the part in 3D in the conversation

What you can ask

SpeakCAD is for functional parts with real measurements: enclosures for a PCB or a Raspberry Pi, brackets, wall mounts, holders, adapters, organizers, replacement clips and knobs. Requests that work as they are:

• “Use SpeakCAD to design a wall mount for my Wi-Fi router: it is 180 x 120 x 35 mm, the cables come out of the back, and it hangs on two screws 100 mm apart.”
• “Design a case for a Raspberry Pi 5 with SpeakCAD: 2 mm walls, a 30 mm fan cutout in the lid, openings for the USB-C, both micro-HDMI and the Ethernet port, and four rubber feet pockets.”
• “I need a hook for a 40 mm round pipe that holds a 2 kg bag. Ask me what you need to know, then design it with SpeakCAD.”
• “Make the walls 3 mm and add a 5 mm hole in the centre of the lid.”
• “Slice it for my Bambu Lab A1 in PETG, 0.2 mm layers, 30% infill.”

Good requests share three things: measurements in millimetres, what the part fits or holds, and how it attaches. How to describe a part has templates.

The part in the conversation

Claude renders interactive tools, and SpeakCAD uses that: while the part is designed, a card shows "SpeakCAD is designing your part…", then the part in 3D with its size and version. In the card you can:

• Type new dimensions (wall thickness, width, hole diameter…) and apply them: no AI, no credits, a new version.
• Ask for a change in words, in the card or in the chat (2 credits, included in Unlimited).
• Download STL or 3MF, a link valid 24 hours.
• Slice it for your printer, with the nozzle, profile, material, infill, walls, supports and speed, and download the G-code with the print time and filament weight.
• Open it in the SpeakCAD editor, where you click a face to change it, every version is kept, and Fit Check calibrates clearances to your printer.

Claude is told what happens in the card, so you can keep talking about the part. Where a Claude app shows no card, Claude still gets the size, the dimensions and the links.

Claude Code and the desktop app

Connectors belong to your Claude account: add SpeakCAD once on claude.ai or in Claude Desktop and it is in the iPhone and Android apps too. In Claude Code, add the same server from the terminal:

bash
claude mcp add --transport http speakcad https://speakcad.com/api/mcp

then run /mcp in a session to sign in. Handy when the project you are coding needs a case: ask for the enclosure of the board you are wiring up. More clients on the MCP server page.

Which Claude plans

Custom connectors work on every Claude plan; the free plan allows one custom connector. On Team and Enterprise, an Owner adds the connector for the organisation and each member connects their own SpeakCAD account.

What it costs

Adding the connector is free on every Claude plan. What it does is paid from your SpeakCAD account, priced exactly as on the site: 2 credits per AI request (the first design or a change), 10 credits per STL or 3MF download (a paid design re-downloads free after small fixes), and 5 credits more for G-code sliced for your printer (included in Pro and Unlimited). Unlimited also includes the requests and downloads. Typing new dimensions in the card and turning the part around in 3D spend nothing.

What Claude and SpeakCAD see

Claude sends SpeakCAD the description of the part, each change you ask for, and the printer and settings for a slice; SpeakCAD never sees the rest of the conversation. Files come back as download links, and a file you drop on the card goes from your browser to the slicer, not through Claude. Connected assistants on your SpeakCAD Plan page disconnects Claude at once. Details: the privacy policy.

No connector? Paste the description

Ask Claude to write the part down with every measurement and paste that text into SpeakCAD: the numbers are used exactly. ChatGPT to STL shows what to keep from the conversation; it works the same with Claude.