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
NeoPixel LED Module with Pen Holder Design
ELECTRICAL · NEOPIXEL LED

NeoPixel LED Module with Pen Holder Design

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

Precision Mechanical Component CAD Model

.STEP
Free
Industrial Mechanical Component CAD Model
MACHINE DESIGN · MECHANICAL COMPONENT

Industrial Mechanical Component CAD Model

.STEP
Free
Precision Mechanical Component with Verified Dimensions
MACHINE DESIGN · PRECISION MECHANICAL COMPONENT

Precision Mechanical Component with Verified Dimensions

.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
Lumenier N2O Feather-Lite 1300mAh 6S 150C Battery CAD Model
ROBOTICS · LUMENIER N2O

Lumenier N2O Feather-Lite 1300mAh 6S 150C Battery CAD Model

.STEP
Free
High Capacity 10000uF Capacitor CAD Model for Power Electronics
ELECTRICAL · 10000UF CAPACITOR

High Capacity 10000uF Capacitor CAD Model for Power Electronics

.STEP
Free
Castle Creations Mamba Monster X ESC CAD Model Without Fan
ROBOTICS · CASTLE CREATIONS MAMBA MONSTER X

Castle Creations Mamba Monster X ESC CAD Model Without Fan

.STEP
Free
Detailed CAD Model of 5065 Sensored Outrunner Motor by Alien Power System
ROBOTICS · 5065 SENSORED OUTRUNNER MOTOR

Detailed CAD Model of 5065 Sensored Outrunner Motor by Alien Power System

.STEP
Free
Shock Isolation Clamp Mount for Brushless Mega Spark Motor and Gearbox
ROBOTICS · SHOCK ISOLATION CLAMP MOUNT

Shock Isolation Clamp Mount for Brushless Mega Spark Motor and Gearbox

.STEP
Free
3D Print Controller Box with Atena SIM800 Module
3D PRINTING · 3D PRINT CONTROLLER BOX

3D Print Controller Box with Atena SIM800 Module

.STEP
Free
Robotic Arm Cable Drive System for Reduced Inertia in Wrist and Elbow
ROBOTICS · ROBOTIC ARM

Robotic Arm Cable Drive System for Reduced Inertia in Wrist and Elbow

.STEP
Free
3D Printed Robot with Nema 17 and Nema 23 Stepper Motors for Arduino
ROBOTICS · 3D PRINTED ROBOT

3D Printed Robot with Nema 17 and Nema 23 Stepper Motors for Arduino

.STEP
Free
All-Purpose Wooden Craft Sticks for Multipurpose Use
WOODEN CRAFT STICKS

All-Purpose Wooden Craft Sticks for Multipurpose Use

.STEP
Free
Unitree Z1 Robotic Arm for Mobile Robot Integration
ROBOTICS · UNITREE Z1

Unitree Z1 Robotic Arm for Mobile Robot Integration

.STEP
Free
Gantry Structure CAD Model for Industrial Applications
MACHINE DESIGN · GANTRY STRUCTURE

Gantry Structure CAD Model for Industrial Applications

.STEP
Free
Swerve Chassis for Robotics Competition Applications
ROBOTICS · SWERVE CHASSIS

Swerve Chassis for Robotics Competition Applications

.STEP
Free
Micro Drone Design for Compact Aerial Applications
ROBOTICS · MICRO DRONE

Micro Drone Design for Compact Aerial Applications

.STEP
Free
3s2p LiFe Battery Pack for Industrial Applications
ENERGY AND POWER · 3S2P LIFE BATTERY PACK

3s2p LiFe Battery Pack for Industrial Applications

.STEP
Free
One Sleigh Drone Design
AVIATION · DRONE

One Sleigh Drone Design

.STEP
Free
1.5kW 18000 RPM Spindle Motor CAD Model
MACHINE DESIGN · 1.5KW SPINDLE MOTOR

1.5kW 18000 RPM Spindle Motor CAD Model

.STEP
Free
LRS-75-12 AC/DC Power Supply 12V 6A 72W by MEAN WELL USA
ELECTRICAL · LRS-75-12

LRS-75-12 AC/DC Power Supply 12V 6A 72W by MEAN WELL USA

.STEP
Free
Gravity Roller Conveyor for Machine Assembly Line Applications
INDUSTRIAL DESIGN · GRAVITY ROLLER CONVEYOR

Gravity Roller Conveyor for Machine Assembly Line Applications

.STEP