Engineering CAD Design Library

Browse quality-checked 3D CAD models for engineering, product design, prototyping and manufacturing. Preview models online and download files in STEP, STP, IGES, STL, OBJ, PLY, DWG, DXF and more.

Browse by part & function

The axis engineers actually search on — pick a part type to filter the catalog.

See all parts

Build kits

Curated systems with verified mating parts — download the whole assembly at once.

All collections
CONSUMER ELECTRONICS

iPhone Accessory & Case Design Kit

A practical iPhone accessory cluster for designing cases, charging stands, holders and fit-checking around real phone geometry.

6 partspairs verified
DRONES / UAV

250 mm FPV Drone Build Kit

A complete FPV quad build cluster covering frame, propulsion, camera, control electronics, battery housing and mounting hardware.

9 partspairs verified
MOTION CONTROL

NEMA 17 Motion / Linear Actuator Kit

A motion-control cluster around a NEMA 17 stepper, bracket, coupler, GT2 belt, pulley, bearing and driver.

10 partspairs verified
HARDWARE

Metric Fasteners & Threaded Hardware Pack

A reusable ISO/metric fastener library cluster with screws, nuts, washers, inserts, standoffs and bolt assemblies.

6 partspairs verified
3D PRINTING

3D Printer Motion & Extruder Upgrade Kit

A 3D-printer upgrade cluster combining hotend parts, filament handling, stepper drive and motion hardware.

14 partspairs verified
ELECTRONICS PROTOTYPING

Arduino / ESP32 Prototyping Kit

A maker electronics cluster with Arduino, ESP32, breadboard, shield, servo, battery holder and enclosure.

13 partspairs verified
ROBOTICS

Robotic Arm + Gripper Kit

A robotic manipulator cluster with 6-DOF arm, gripper, wrist, servo mounts, actuator and linear guide components.

12 partspairs verified
CNC MACHINING

CNC Workholding & Tooling Kit

A CNC machining cluster covering table, clamping, vise, chuck, collet holder, spindle and ball-screw motion.

14 partspairs verified
HVAC / DUCTING

HVAC Ventilation Duct Assembly Kit

A ventilation product cluster with grille, damper, duct adapter, fan, filter, flange and duct clamp.

8 partspairs verified
FLUID POWER

Hydraulic / Pneumatic Pump & Valve Manifold Kit

A fluid-power cluster combining pump, valves, pressure gauge, manifold block, pipe and coupling parts.

16 partspairs verified
MOBILE ROBOTICS

RC / Line-Follower Robot Chassis Kit

A small mobile-robot cluster with chassis, wheels, hubs, motors, motor mounts, controller, battery holder and damper.

16 partspairs verified
WORKSPACE ACCESSORIES

Desk Cable + Phone Stand Workstation Kit

A desk-organization product cluster combining cable routing, phone holders, headphone stands and laptop/iMac stands.

8 partspairs verified
CAMERA / IMAGING RIGS

Camera Gimbal & Mount Rig Kit

A camera-rig cluster with gimbal, camera modules, tripod, tilt head, GoPro mount and camera bracket parts.

8 partspairs verified
AUTOMOTIVE & MOBILITY

1:10 RC Car Drivetrain & Suspension Kit

A 1:10 RC Car Drivetrain & Suspension Kit cluster covering related CAD components for Automotive & Mobility.

5 partspairs verified
ROBOTICS & MECHATRONICS

Arduino / ESP32 Prototyping Kit; CNC Workholding & Tooling Kit

A Arduino / ESP32 Prototyping Kit; CNC Workholding & Tooling Kit cluster covering related CAD components for Robotics & Mechatronics.

1 partpairs verified
MOTORS & POWER TRANSMISSION

Arduino / ESP32 Prototyping Kit; RC / Line-Follower Robot Chassis Kit

A Arduino / ESP32 Prototyping Kit; RC / Line-Follower Robot Chassis Kit cluster covering related CAD components for Motors & Power Transmission.

1 partpairs verified
HYDRAULICS & PNEUMATICS

Belt & Roller Conveyor Design Kit

A Belt & Roller Conveyor Design Kit cluster covering related CAD components for Hydraulics & Pneumatics.

9 partspairs verified
PUMPS & FLUID SYSTEMS

Centrifugal Pump & Motor Skid Kit

A Centrifugal Pump & Motor Skid Kit cluster covering related CAD components for Pumps & Fluid Systems.

8 partspairs verified
GENERAL ENGINEERING

Honda C-Series Engine Parts Pack

A Honda C-Series Engine Parts Pack cluster covering related CAD components for General Engineering.

4 partspairs verified
VALVES & FLOW CONTROL

Hydraulic / Pneumatic Pump & Valve Manifold Kit; Industrial Valve & Actuation Pack

A Hydraulic / Pneumatic Pump & Valve Manifold Kit; Industrial Valve & Actuation Pack cluster covering related CAD components for Valves & Flow Control.

1 partpairs verified
ENCLOSURES & PANELS

IP65/IP67 Electrical Enclosure & Control Panel Pack

A IP65/IP67 Electrical Enclosure & Control Panel Pack cluster covering related CAD components for Enclosures & Panels.

9 partspairs verified
GENERAL ENGINEERING

Industrial Gearmotor & Drive Kit

A Industrial Gearmotor & Drive Kit cluster covering related CAD components for General Engineering.

9 partspairs verified
VALVES & FLOW CONTROL

Industrial Valve & Actuation Pack

A Industrial Valve & Actuation Pack cluster covering related CAD components for Valves & Flow Control.

9 partspairs verified
PUMPS & FLUID SYSTEMS

Peristaltic / Dosing Pump Prototyping Kit

A Peristaltic / Dosing Pump Prototyping Kit cluster covering related CAD components for Pumps & Fluid Systems.

9 partspairs verified
ROBOTICS & MECHATRONICS

Raspberry Pi Case & Display Kit

A Raspberry Pi Case & Display Kit cluster covering related CAD components for Robotics & Mechatronics.

6 partspairs verified
ENGINES & POWERTRAIN

Superquadro Engine Internals Kit

A Superquadro Engine Internals Kit cluster covering related CAD components for Engines & Powertrain.

4 partspairs verified
PUMPS & FLUID SYSTEMS

Vacuum Pump System Pack

A Vacuum Pump System Pack cluster covering related CAD components for Pumps & Fluid Systems.

9 partspairs verified
10,000+ models2D drawings
Sort by:
Free
Industrial Propeller CAD Model for Engineering Applications
MARINE · INDUSTRIAL PROPELLER

Industrial Propeller CAD Model for Engineering Applications

.STEP
Free
180 Degree Sphere with 10 Degree Angle Markings CAD Model
INDUSTRIAL DESIGN · 180 DEGREE SPHERE

180 Degree Sphere with 10 Degree Angle Markings CAD Model

.STEP
Free
Frsky RX6R Telemetry Receiver for Remote Control Systems
ROBOTICS · FRSKY RX6R

Frsky RX6R Telemetry Receiver for Remote Control Systems

.STEP
Free
Garmin GNC 255 VHF/NAV Radio System
AVIATION · GARMIN GNC 255

Garmin GNC 255 VHF/NAV Radio System

.STEP

Need a CAD file that is not in the library?

Share your requirement and Marathon OS will match you with a vetted CAD designer for production-ready CAD files, edits and manufacturing documentation.

Get it Built
500+Projects Done
24 hrResponse
15+CAD Tools
Free
MINERVA-II-1a Asteroid Lander Model for Space Exploration
AEROSPACE · MINERVA-II-1A

MINERVA-II-1a Asteroid Lander Model for Space Exploration

.STEP
Free
MINERVA-IIb Asteroid Rover Model for Space Exploration
AEROSPACE · MINERVA-IIB

MINERVA-IIb Asteroid Rover Model for Space Exploration

.STEP
Free
Adaptive Wing Design with Compliant Mechanism for Morphing Aerodynamics
AEROSPACE · ADAPTIVE WING

Adaptive Wing Design with Compliant Mechanism for Morphing Aerodynamics

.STEP
Free
Conceptual Robotic System for Lunar Delivery Challenge
ROBOTICS · LUNAR DELIVERY

Conceptual Robotic System for Lunar Delivery Challenge

.STEP
Free
Carburetor Assembly for Black Bull 253 Paramotor
AVIATION · CARBURETOR

Carburetor Assembly for Black Bull 253 Paramotor

.STEP
Free
Compressed Air Treatment Equipment with Regulator, Filter, Lubricator, Separator, and Dryer
INDUSTRIAL DESIGN · COMPRESSED AIR TREATMENT

Compressed Air Treatment Equipment with Regulator, Filter, Lubricator, Separator, and Dryer

.STEP
Free
Cessna 172 Style Small Aircraft CAD Model with Landing Gear and Control Surfaces
AVIATION · CESSNA 172

Cessna 172 Style Small Aircraft CAD Model with Landing Gear and Control Surfaces

.STEP
Free
Micro Servo 9g SG90 for Aeromodelling and UAV Drones
AVIATION · MICRO SERVO 9G SG90

Micro Servo 9g SG90 for Aeromodelling and UAV Drones

.STEP
Free
X27.168 Stepper Motor for Automotive and Simulation Applications
AUTOMOTIVE · X27.168

X27.168 Stepper Motor for Automotive and Simulation Applications

.STEP
Free
Shockflyer Model Constructed from 3mm Foam Materials
AVIATION · SHOCKFLYER

Shockflyer Model Constructed from 3mm Foam Materials

.STEP
Free
Vertical Water Separator Filter Vessel for Industrial Applications
INDUSTRIAL DESIGN · VERTICAL WATER SEPARATOR

Vertical Water Separator Filter Vessel for Industrial Applications

.STEP
Free
Turret Assembly CAD Model for Industrial Applications
MACHINE DESIGN · TURRET ASSEMBLY

Turret Assembly CAD Model for Industrial Applications

.STEP
Free
26-Inch Horizontal Fuel Water Separator for Industrial Applications
INDUSTRIAL DESIGN · FUEL WATER SEPARATOR

26-Inch Horizontal Fuel Water Separator for Industrial Applications

.STEP
Free
3D CAD Model Designed with Inventor and Rendered in Keyshot
INDUSTRIAL DESIGN · INVENTOR

3D CAD Model Designed with Inventor and Rendered in Keyshot

.STEP
Free
3D Printed Thin Skin Reinforcement Mesh Model
3D PRINTING · THIN SKIN REINFORCEMENT

3D Printed Thin Skin Reinforcement Mesh Model

.STEP
Free
Wombat 2-Cycle Model Engine Designed by Edgar T. Westbury
MACHINE DESIGN · WOMBAT 2-CYCLE

Wombat 2-Cycle Model Engine Designed by Edgar T. Westbury

.STEP
Free
Wooden Hand Glider CAD Model for Educational Use
AVIATION · WOODEN HAND GLIDER

Wooden Hand Glider CAD Model for Educational Use

.STEP
Free
Drone Storage Box with Sliding Acrylic Panel and Magnetic Closure
ROBOTICS · DRONE STORAGE BOX

Drone Storage Box with Sliding Acrylic Panel and Magnetic Closure

.STEP