HappyCAD

AI CAD for mechanical design and product development.

Describe a mechanical part in plain language. HappyCAD turns your requirements into an editable 3D CAD model, checks fit and manufacturability, and delivers STEP files and engineering drawings.

Bike wall mount

Material
6061 aluminum
Size
70 × 110 × 90 mm
Fasteners
4 × M5 countersunk
Start designing for freeSee how AI CAD works

From design requirements to a 3D CAD model.

  1. 1

    Describe your mechanical design

    Describe the part’s function, dimensions, loads, and mounting requirements. HappyCAD asks for missing details before creating your CAD model.

    A 5-inch FPV frame for freestyle. 2306 motors, a 30 mm stack, and it has to survive crashes.

    Here is what I will design. Tell me if anything is off.

    • 220 mm wheelbase for 5-inch props, 28 mm of clearance
    • 6 mm carbon-fibre nylon, so it prints at home
    • 16 × 19 mm motor pattern, 30.5 mm stack
    • Wide arm roots, since crashes load them hardest
  2. 2

    Generate an editable parametric CAD model

    HappyCAD develops the geometry, selects a material, and builds a parametric 3D model with editable features.

    fpv-frame-5inFeature tree
    1. Frame plate44 × 84 × 6 mm
    2. Arms4 × 17 mm at 45°
    3. Motor pads16 × 19 mm, M3
    4. Stack mount30.5 mm, M3
    5. Lightening slots4 × 34 mm
    6. Top plateon 25 mm standoffs
  3. 3

    Check fit and design for manufacturing

    HappyCAD checks stress, fit, and manufacturability to support your design for manufacturing (DFM) review before fabrication.

    Crash load at a motor
    50 g
    Peak stress, arm root
    31 MPa
    Safety factor
    2.4
    Frame weight
    96 g
  4. 4

    Export CAD files and engineering drawings

    Download your CAD model and dimensioned engineering drawings. Share the files with a machine shop or continue the design in your preferred CAD software.

    Printed, 2 h 40 min

    Time-lapse

    • Print it at homeCF nylon, 2 h 40 min
    • Send it to a shopQuote-ready drawing
    • Open it in CADSTEP for any CAD tool

Editable CAD models, engineering drawings, and manufacturing files.

Export STEP models, dimensioned mechanical drawings, a bill of materials, and manufacturing files. Explore the robot gripper example below to see each output.

Format
STEP AP242
Parts
11, fully editable
Envelope
100 × 36 × 120 mm
Mass
212 g
Compatible CAD software
SolidWorks, Fusion, Onshape

Engineering drawings communicate dimensions and manufacturing requirements. Geometric dimensioning and tolerancing (GD&T) defines allowable variation in a part’s geometry, helping designers communicate how parts must fit and function. Explore our guide to GD&T and engineering drawing review.

Mechanical parts and assemblies designed with AI CAD.

Explore CAD models for a robot gripper, planetary gearbox, drone frame, bike mount, and replacement knob. Each example shows how a written description becomes a mechanical design.

Swipe to see the whole shelf.

  • Amp knob

    Custom replacement part with a specified shaft fit

    “A knurled replacement knob for my vintage amp, 6 mm D-shaft.”

  • Robot gripper

    Robot gripper design for robotics applications

    “A two-finger parallel gripper for my robot arm, ISO flange, 20 mm stroke.”

  • Bike wall mount

    Mechanical bracket design with load and fastener requirements

    “A wall mount for my road bike. It should hold 12 kg and use four screws.”

  • Planetary gearbox

    Planetary gearbox CAD model and assembly

    “A 3.6:1 planetary gearbox with three planets, in a housing I can bolt down.”

  • Drone frame

    Drone frame design with defined mounting dimensions

    “A 5-inch quadcopter frame, 220 mm wheelbase, for 2306 motors and a 30 mm stack.”

Create 3D CAD models without learning a traditional CAD workflow.

Describe your part and let HappyCAD handle the CAD modeling steps. Compare the traditional workflow with AI CAD using the same bike mount.

The same bike mount, made two ways

Traditional CAD modeling

Then export

AI CAD with HappyCAD

Describe your part. Get an editable CAD model and engineering drawings.
  • Weeks of trainingOne sentence
  • A paid license per seatFree to start
  • Rework the model by handAsk for the change
  • Private by defaultNever used to train models.
  • No lock-inSTEP, STL, 3MF and PDF.
  • Nothing to installRuns in your browser.

AI CAD for makers, product designers, and mechanical engineers.

Makers and custom part designers

Design custom mounts, replacement parts, organizers, and adapters. Turn your measurements and ideas into 3D CAD models for fabrication.

Point at anything on the board to see what was asked for.

Hardware founders and product designers

Move from a product idea to a mechanical design with an editable CAD model and dimensioned drawings you can share with a machine shop for a quote.

Sketch
3D model
Shop drawing

Mechanical engineering and robotics teams

Delegate routine CAD modeling for brackets, fixtures, mounts, and robot components. Review the mechanical design and request changes in plain language.

ML

Mechanical leadCan the bracket take 20 kg instead of 12?

HappyCADDone. Gussets are now 6 mm and the plate 6 mm thick. Safety factor 4.1, drawing updated.

Approved for production

Built by engineers from AWS, DeepMind, Stanford and UC Berkeley. Powered by the Energent agent platform.

Keep your CAD models and product designs private.

Protect your CAD files, engineering drawings, and product design data with private workspaces, encryption, and team access controls.

  • Private by defaultYour designs are never used to train models.
  • EncryptedIn transit and at rest.
  • Isolated workspacesYour data never mixes with anyone else’s.
  • Access controlRoles and an audit log for every team.
  • SOC 2 Type IIIndependent audit underway.
  • GDPR alignedBuilt for global data protection rules.

Questions, answered.

  • HappyCAD creates 3D CAD models for brackets, mounts, enclosures, gears, adapters, fixtures, and replacement parts. It works best with individual mechanical parts and small assemblies.

  • No. Describe your part in plain language, including the dimensions and requirements you know. Experienced CAD users can export a STEP file and continue working in SolidWorks, Fusion, or Onshape.

  • HappyCAD provides a STEP model, a dimensioned engineering drawing in PDF format, a bill of materials, STL and 3MF files, and G-code for CNC machining.

  • Yes. Request changes such as “make it 10 mm wider” or “add a mounting hole.” HappyCAD updates the CAD model and its engineering drawing together.

  • You own your designs. Your CAD models and engineering drawings remain private to your account and are not used to train models.

  • GD&T stands for geometric dimensioning and tolerancing. It uses symbols and tolerances to communicate allowable variation in a part’s form, orientation, and location. Review the GD&T requirements relevant to your part before manufacturing.

Turn your next mechanical design into a 3D CAD model.

Start designing for free. No CAD experience required.