Features
Everything a functional 3D print needs
SpeakCAD is not a general-purpose CAD program. It is the most intuitive CAD for 3D printing: tap a face and type a size, or describe the part to the AI, and get a file your printer accepts, an STL or 3MF for your slicer or G-code already sliced for your printer. It runs entirely in your browser, on a phone or a computer, with nothing to install.Hand tools that stay in millimetres
Tap a face: a hole with its screw head, a pocket cut out, a tab added, raised or engraved text, a flat face pulled out or pushed in, the corners of the part rounded, or a measurement between two points, and any hole, cut, tab or text copied in a row, a grid or a circle. Every size and position is typed, nothing is dragged. Free.Live 3D preview
Each answer compiles and renders right in your browser tab. Orbit, zoom, check dimensions and volume.Edit by chatting
“Make the walls 2 mm thicker.” “Add a cable slot underneath.” Each request updates the design in place.Fit Check: parts that fit the first time
The AI spots the part that must fit a real object and cuts a five-minute test slice of it. Tell SpeakCAD how it fitted and it learns your printer.Duplicate an object with your phone
Photograph a part next to a ruler, top and side. The AI reads the scale and models a copy you can adjust before printing.STL, 3MF or G-code sliced for your printer
Manifold meshes for your own slicer, or G-code already sliced for your printer. One download, any format, and fixes re-download free.Online slicer for your own STL or 3MF
Already have the file? Slice it in the browser with your printer's OrcaSlicer profile and download G-code. Free with a free account, no card, no credits: up to 10 files a day (60 on a paid plan).Inside ChatGPT and Claude
Ask ChatGPT or Claude for the part: SpeakCAD designs it, shows it in 3D in the chat and hands over the STL or G-code.Designed for FDM by default
Minimum wall thickness, fit clearances, flat bottoms and no floating geometry, without asking.Photos, sketches and STL references
Attach a picture of the broken part, a napkin sketch or an existing STL to build around.Fair credits, downloads included
The hand tools and the files they make are free. For the AI: Maker at $7.99/mo for 50 credits, or Pro at $14.99/mo for 200, downloads included in every plan.Built for your phone. Nothing to install.
The full editor runs in Safari on iPhone and iPad and Chrome on Android, as well as on any laptop. The first render usually appears within a minute or two: a new part gets deeper reasoning through the geometry, and small edits land in seconds.Parametric under the hood
Models are real parametric programs, not frozen meshes. Every dimension, typed by you or chosen by the AI, stays editable for as long as you want.A marketplace of editable parts
Get free print-ready models from other makers, adapt them before you print, or share your own.Say it or shape it
Describe the part in plain English, sizes, purpose, what it attaches to, and the AI builds it. Or pick a starter and shape it yourself with the hand tools. One editor, both ways.Say “a bracket that holds a 32 mm pipe against a wall with two M4 screws” and the AI writes a model with exactly those numbers, usually within a minute or two. Prefer to do it yourself? Start from a box or a plate and add the holes and cuts by hand. The two mix: the AI reads your hand edits as part of the model, and you can tap a number the AI chose and type another. No tutorial to sit through first.
Hand tools that stay in millimetres
Tap a face: a hole with its screw head, a pocket cut out, a tab added, raised or engraved text, a flat face pulled out or pushed in, the corners of the part rounded, or a measurement between two points, and any hole, cut, tab or text copied in a row, a grid or a circle. Every size and position is typed, nothing is dragged. Free.Start from a box, a plate, a cylinder or a tray, or from your own STL or 3MF (a new model's empty editor offers both), and shape it with your thumb: tap the face where the hole goes and type its diameter (M3, M4 and the other screw sizes are one tap away, with a counterbore or a countersink for the screw head), then its centre's distance from the face's edges (Centre 12 mm from the left edge, or Centre on the face), cut a pocket or a slot to size, add a tab or a boss, write raised or engraved text, pull a whole flat face out or push it in by a typed distance with Extrude, round the corners of a part, round or chamfer the edges around a flat face with Fillet, hollow the part to a typed wall with Shell, measure between two points. Duplicate turns a hole, a cut, a tab or a text into a row, a grid or a circle of copies, with the count and the spacing typed. Each tool makes a numbered version you can undo, and the model rebuilds in your browser in about a second. Shaping by hand and downloading what you shaped are free, with a free account. For what the tools do not do (round an edge of a curved face, move a lid, add a snap fit), ask the AI in the same chat.
Live 3D preview
Each answer compiles and renders right in your browser tab. Orbit, zoom, check dimensions and volume.Every answer is compiled to a mesh right in the browser tab, then shown on a 220 x 220 mm virtual print bed with a dimensions readout, volume estimate and triangle count. Wireframe mode shows the exact geometry slicers will see.
Edit by chatting
“Make the walls 2 mm thicker.” “Add a cable slot underneath.” Each request updates the design in place.Models are fully parametric under the hood: every important dimension is a named variable, so a follow-up edit changes one number rather than rebuilding the part. Each round is one request of 1 or 2 credits, whichever model answers it (3 for a design change).
Fit Check: parts that fit the first time
The AI spots the part that must fit a real object and cuts a five-minute test slice of it. Tell SpeakCAD how it fitted and it learns your printer.A phone slot, a PCB pocket, a snap lid, a magnet hole: a fit that is 0.2 mm off wastes a print of several hours. When a model has an interface that must mate with a real object, the AI marks it and SpeakCAD cuts a fit coupon from the model itself, a thin slice of just that interface, in the same print orientation. It is free, prints in about five minutes and uses a gram or two of filament. Try it on the real thing and tap too tight, perfect or too loose on your phone, next to the printer. The answer calibrates your printer on your account, and every model you build afterwards is compiled with the clearance your printer needs, including models you buy on the marketplace. We know of no other AI CAD tool that follows the part all the way to whether it fits.
Duplicate an object with your phone
Photograph a part next to a ruler, top and side. The AI reads the scale and models a copy you can adjust before printing.No scanner and no photogrammetry: the guided capture asks for a top view and a side view with a millimetre ruler in frame, plus one sentence about what the object is. The AI converts pixels to millimetres from the ruler, models the part as a parametric program, and lists the dimensions it read so you can check them with callipers. Type one measured size and the copy snaps to it.
STL, 3MF or G-code sliced for your printer
Manifold meshes for your own slicer, or G-code already sliced for your printer. One download, any format, and fixes re-download free.Geometry is built with solid booleans (CSG), so STL and 3MF exports are closed, manifold meshes that never need a repair pass. Or skip the slicer: pick your printer from more than 380 models (Bambu Lab, Prusa, Creality, Elegoo, Anycubic, Voron and more), choose material, quality, infill and supports, and download G-code produced by OrcaSlicer with that printer's own profile. Bambu printers get a sliced 3MF they open directly. A sliced download costs the same as the STL: included in every plan, from Maker up. Small fixes after a test print re-download at no cost.
Already have the file? Slice it in the browser with your printer's OrcaSlicer profile and download G-code. Free with a free account, no card, no credits: up to 10 files a day (60 on a paid plan).Not every print needs a new design. Upload an STL or 3MF of up to 50 MB, pick your printer among 380+ models from 60+ brands, choose the layer height, filament, infill, supports, speed, walls and bed adhesion, and download a .gcode (a sliced .gcode.3mf for Bambu Lab) with the print time and filament weight. The slicing is done by the unmodified OrcaSlicer on SpeakCAD's slicer service, and the file is sliced in a temporary folder deleted when the job ends. It works on a Chromebook, an iPad or a phone as well as a computer. The online slicer is free with a free account (no card, no credits): up to 10 files a day, and re-slicing the same file with other settings within 24 hours does not count. Accounts on a paid plan slice up to 60 files a day.
Ask ChatGPT or Claude for the part: SpeakCAD designs it, shows it in 3D in the chat and hands over the STL or G-code.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. Same account and credits as on the site, and the part opens in the editor in one click. Developers add the same MCP server to Claude Code, Cursor or VS Code.
Designed for FDM by default
Minimum wall thickness, fit clearances, flat bottoms and no floating geometry, without asking.The engine applies printability rules to every model: walls at least 1.2 mm, floors at least 1 mm, 0.2 to 0.3 mm clearance for press fits, parts resting on the bed, no unsupported overhangs where a chamfer would do. You can override any of them.
Photos, sketches and STL references
Attach a picture of the broken part, a napkin sketch or an existing STL to build around.The AI reads images, so “the clip in this photo, 40 mm wide” works. Upload an STL or 3MF and ask for a lid, a stand or a modified version; upload a .scad file to keep editing a parametric model you already have.
Fair credits, downloads included
The hand tools and the files they make are free. For the AI: Maker at $7.99/mo for 50 credits, or Pro at $14.99/mo for 200, downloads included in every plan.Shaping a part by hand (a hole and its screw head, a cut, an added tab, raised or engraved text, an extruded face, rounded corners, and copies in a row, a grid or a circle) and downloading what you shaped are free. A new part or a design change by the AI spends 3 credits, a small change 2, a quick edit 1; downloads are included in every plan (4 credits without one), and G-code sliced for your printer costs the same as the STL. A plan adds credits every month, whichever model answers, and includes the downloads. Without a plan, small fixes after a test print (a hole a bit wider, a wall a bit thicker) re-download at no cost. Models stay private on every plan unless you publish them, and you can cancel anytime.
Built for your phone. Nothing to install.
The full editor runs in Safari on iPhone and iPad and Chrome on Android, as well as on any laptop. The first render usually appears within a minute or two: a new part gets deeper reasoning through the geometry, and small edits land in seconds.SpeakCAD runs entirely in your browser: the AI, the 3D engine and the viewer all live inside the tab, laid out for a thumb on a phone and for a mouse on a desktop. There is nothing to download or install, no app store, no licence to manage, and the same project opens on every device. The only files you ever download are your finished STL, 3MF or G-code, and on a phone they land in Files or Downloads. A typical functional part, with a couple of edits and a dimension check, is a downloaded file in about 10 to 15 minutes.
Parametric under the hood
Models are real parametric programs, not frozen meshes. Every dimension, typed by you or chosen by the AI, stays editable for as long as you want.Behind every render is a program, not a mesh: your hand edits and the AI's answers live in the same program as named numbers, so a follow-up changes one value instead of rebuilding the part. Undo and redo across versions, and come back months later to adjust a dimension. A mesh freezes a design; the parametric model keeps it alive.
A marketplace of editable parts
Get free print-ready models from other makers, adapt them before you print, or share your own.Every model on the SpeakCAD marketplace is a live design, not a frozen STL: get it free, type or tell the AI your own dimensions, download the STL or 3MF. Publish anything you designed to share it; on an account that has paid, a model you downloaded earns 10 credits when you submit it. Ratings come only from people who actually got the model.