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
Steam Water Sampling System with 17 Sample Lines for HRSG Plants
ENERGY AND POWER · STEAM WATER SAMPLING SYSTEM

Steam Water Sampling System with 17 Sample Lines for HRSG Plants

.STEP
Free
Nissan GT-R 3D Model Created with Surface Modeling Techniques
AUTOMOTIVE · NISSAN GT-R

Nissan GT-R 3D Model Created with Surface Modeling Techniques

.STEP
Free
Wilwood Mustang II Spindle 830-9807 CAD Model with Accurate Dimensions
AUTOMOTIVE · WILWOOD MUSTANG II SPINDLE 830-9807

Wilwood Mustang II Spindle 830-9807 CAD Model with Accurate Dimensions

.STEP
Free
Detailed 3D Bicycle Frame Model for Engineering and Design
AUTOMOTIVE · BICYCLE FRAME

Detailed 3D Bicycle Frame Model for Engineering and Design

.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
Honda CB 750 Motorcycle Frame 3D CAD Model
AUTOMOTIVE · HONDA CB 750

Honda CB 750 Motorcycle Frame 3D CAD Model

.STEP
Free
Inwheel Motor Suspension System Design
AUTOMOTIVE · INWHEEL MOTOR

Inwheel Motor Suspension System Design

.STEP
Free
High Accuracy Shear Beam Load Cell 100kg to 250kg Capacity
INDUSTRIAL DESIGN · SHEAR BEAM LOAD CELL

High Accuracy Shear Beam Load Cell 100kg to 250kg Capacity

.STEP
Free
Spring Clip BN 38613 and Connector BN 38614 Components
INDUSTRIAL DESIGN · SPRING CLIP

Spring Clip BN 38613 and Connector BN 38614 Components

.STEP
Free
38 cm Diameter Subwoofer Enclosure with 80mm Vent
INDUSTRIAL DESIGN · SUBWOOFER ENCLOSURE

38 cm Diameter Subwoofer Enclosure with 80mm Vent

.STEP
Free
Industrial Flange Component for Mechanical Assemblies
MACHINE DESIGN · INDUSTRIAL FLANGE

Industrial Flange Component for Mechanical Assemblies

.STEP
Free
Silent Block Vibration Dampening Component
MACHINE DESIGN · SILENT BLOCK

Silent Block Vibration Dampening Component

.STEP
Free
Aerodynamic Dual-Layer Roll Cage for Baja Vehicle
AUTOMOTIVE · DUAL-LAYER ROLL CAGE

Aerodynamic Dual-Layer Roll Cage for Baja Vehicle

.STEP
Free
M8 Step Nut Retainer CAD Model
MACHINE DESIGN · M8 STEP NUT RETAINER

M8 Step Nut Retainer CAD Model

.STEP
Free
10 Inch Winch Synthetic Rope Guide for Industrial Applications
INDUSTRIAL DESIGN · 10 INCH WINCH

10 Inch Winch Synthetic Rope Guide for Industrial Applications

.STEP
Free
Trailer Tire with 13-Inch 4-Hole Wheel and ST175/70D13 Tire Size
AUTOMOTIVE · TRAILER TIRE

Trailer Tire with 13-Inch 4-Hole Wheel and ST175/70D13 Tire Size

.STEP
Free
Steel Shaft Motor 2110-5208009
MACHINE DESIGN · STEEL SHAFT

Steel Shaft Motor 2110-5208009

.STEP
Free
Industrial Flywheel Component for Mechanical Systems
MACHINE DESIGN · FLYWHEEL

Industrial Flywheel Component for Mechanical Systems

.STEP
Free
Precision Mechanical Component CAD Model
MACHINE DESIGN · PRECISION COMPONENT

Precision Mechanical Component CAD Model

.STEP
Free
Mercedes Benz Logo Design Concept
AUTOMOTIVE · MERCEDES BENZ

Mercedes Benz Logo Design Concept

.STEP
Free
Thermal Analysis of Cylinder Head Gasket for Engine Optimization
AUTOMOTIVE · THERMAL ANALYSIS

Thermal Analysis of Cylinder Head Gasket for Engine Optimization

.STEP
Free
Car Door Surface Model Using Generative Shape Design
AUTOMOTIVE · CAR DOOR

Car Door Surface Model Using Generative Shape Design

.STEP
Free
Compact Cast Chassis for Electric Vehicles with Modular Design
AUTOMOTIVE · COMPACT CAST CHASSIS

Compact Cast Chassis for Electric Vehicles with Modular Design

.STEP