Describe the part. Get real, editable CAD.
Professional CAD in your browser, with AI built in. Every part comes with its full feature history, ready to edit, 3D print or manufacture. Or model it yourself with the complete set of tools.
- STEP and STL export
- Works with your AI chat app
- Nothing to install
- BaseØ170 plate · DS3218 servo
- Turntable and shoulder2 × 6810 bearings
- Upper arm140 mm · twin plates
- Forearm130 mm · MG996R wrist
- WristPitch and roll · MG90S
- GripperRack and pinion · 2 MGN7 rails
Desktop CAD tools, in a browser tab.
Parametric from the first line: change one dimension and everything built on it follows. Your files save to your account as you work.
- SketchLines, arcs, splines, slots
- ConstraintsTangent · equal · symmetric
- Dimensionswidth = 96 mm
- ExtrudeBlind · symmetric · through all
- Revolve360° or part of a turn
- SweepAlong a path
- LoftSquare → round
- FilletR5
- Chamfer1 mm
- Shell2.4 mm wall
- HoleCounterbore · countersink
- Pattern6 × 360°
- MirrorAbout any plane
- MeasureDistance · angle · area
- Assemblies14 mates and joints
- VersionsNamed, restorable
- Sheet metalFlanges · hems · flat pattern
- DXF exportFor laser and waterjet
- 3D printingPrinter · filament · infill
- STEP importUp to 1 GB, editable
Draw it, describe it, or let your AI app build it.
The same NEMA 17 bracket, with the same features, whichever way you work.
Model it yourself
Sketch with constraints and dimensions, then extrude, fillet and cut. Every feature stays in the history, ready to edit.
- Feature history
- BracketExtrude 56 mm, symmetric
- Inner and outer bendFillet R8 and R14
- Motor cutoutsThrough all
- Adjustment slotsThrough all
- CornersFillet R10
Parts made in SurfaceCAD.
Each one was modelled feature by feature in the CAD Studio and exported straight from it. Pick a part and drag to turn it.
Sensor enclosure
A rounded box shelled to 2.4 mm walls, with screw bosses, a vent pattern and a USB-C port.
- BodyExtrude 34 mm
- Bottom roundFillet R5
- WallsShell 2.4 mm
- Screw bosses4 × 27.6 mm
- Pilot holes4 × 12 mm deep
- Vent slots7 × through all
- USB-C portThrough all
Put parts together and check that they fit.
Insert your parts and standard fasteners, motors and electronics, connect them with mates and joints, and watch them move.
| Item | Part | Qty |
|---|---|---|
| 1 | Lower and top deck | 2 |
| 2 | Front and rear bumper | 2 |
| 3 | Motor bracket | 4 |
| 4 | DC gearmotor JGB37-520 | 4 |
| 5 | Wheel: hub, rim and tyre | 4 |
| 6 | 18650 cells and holder | 3 |
| 7 | Motor driver board | 1 |
| 8 | Raspberry Pi 4 | 1 |
| 9 | Ultrasonic sensor HC-SR04 and bracket | 2 |
| 10 | Toggle switch | 1 |
| 11 | Hex standoffs M3 and M2.5 | 14 |
| 12 | Button head screws M3 | 66 |
| 13 | Other screws and nuts | 27 |
Notes
- Mates and joints. Fastened, concentric, distance and other mates; hinges, sliders and ball joints; gears, racks and screws that drive each other.
- Motion and video. Drive the joints, play an assembly sequence and save it as an MP4.
- Bill of materials. Every part and how many, ready to copy.
- Interference check. Finds parts that overlap before you make them.
Start free. Add the AI when you want it.
- Free$0 USDCAD, assemblies and MCP
- Basic$19 USD7,500 AI credits a month
- Pro$49 USD22,000 AI credits a month
- Max$99 USD48,000 AI credits a month
Monthly prices in US dollars, no tax added; in Mexico, pesos with IVA included. Cancel any time.
Questions
Do I need to install anything?
No. SurfaceCAD runs in a desktop web browser. Sign in with Google or your email and the CAD Studio opens; your files are saved to your account as you work.
Can I use my models in other CAD programs?
Yes. Export any part as STEP for SolidWorks, Fusion, Onshape, FreeCAD and the rest, or as STL for 3D printing. You can also import STEP files.
What is in the free plan?
The CAD Studio, the Assembly Studio, STEP and STL, version history, unlimited files, and AI apps over MCP with no monthly cap on tool calls, for personal use. No card needed.
What does the AI assistant cost?
It comes with the paid plans, from $19 USD a month (no tax added), which gives 7,500 credits. Building a part uses about 75.
Can the AI change my model without me knowing?
Every change it makes is a normal feature in your history and one step of undo. You see it happen, and you can edit, reorder or delete anything it built.
Can I take my files with me?
Always. Download any part as STEP or STL, and export all your account data from Settings → Your data.
Open the Studio
and make your first part.
Free to start. Sign in with Google or your email and you are in the CAD Studio, no download and no card.