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
Autonomous Robotics Sensor Integration for Vehicle Safety
ROBOTICS · AUTONOMOUS ROBOTICS

Autonomous Robotics Sensor Integration for Vehicle Safety

.STEP
Free
Traditional Wooden Canoe CAD Model
MARINE · WOODEN CANOE

Traditional Wooden Canoe CAD Model

.STEP
Free
Sitka Spruce 18ft Motorboat 3D Model
MARINE · SITKA SPRUCE

Sitka Spruce 18ft Motorboat 3D Model

.STEP
Free
ISO Tank Container Document Holder with 75mm Opening
MARINE · ISO TANK CONTAINER

ISO Tank Container Document Holder with 75mm Opening

.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
Offshore Service Ship CAD Model for Marine Engineering
MARINE · OFFSHORE SERVICE SHIP

Offshore Service Ship CAD Model for Marine Engineering

.STEP
Free
Pontoon House Structural Design
ARCHITECTURE · PONTOON HOUSE

Pontoon House Structural Design

.STEP
Free
Miroma Flowform Cascade Component with Aligned Waterway Outlet
INDUSTRIAL DESIGN · MIROMA FLOWFORM

Miroma Flowform Cascade Component with Aligned Waterway Outlet

.STEP
Free
T200 Marine Thruster for Robotics Applications
MARINE · T200

T200 Marine Thruster for Robotics Applications

.STEP
Free
Ultralight Aircraft Float Model with Wooden Hull Design
AVIATION · ULTRALIGHT AIRCRAFT FLOAT

Ultralight Aircraft Float Model with Wooden Hull Design

.STEP
Free
3.20 Meter Hull with 1.40 Meter Beam - Detailed Workshop Documentation
MARINE · 3.20 METER HULL

3.20 Meter Hull with 1.40 Meter Beam - Detailed Workshop Documentation

.STEP
Free
Ship Hull Model with 10 Meter Length and 3.6 Meter Beam
MARINE · SHIP HULL

Ship Hull Model with 10 Meter Length and 3.6 Meter Beam

.STEP
Free
3.80 Meter Length Boat Hull with 1.85 Meter Beam
MARINE · BOAT HULL

3.80 Meter Length Boat Hull with 1.85 Meter Beam

.STEP
Free
Hydraulic Pressure Relief Valve CAD Model
MACHINE DESIGN · HYDRAULIC VALVE

Hydraulic Pressure Relief Valve CAD Model

.STEP
Free
USS New Jersey BB-62 Iowa-Class Battleship Historical Model
MARINE · USS NEW JERSEY BB-62

USS New Jersey BB-62 Iowa-Class Battleship Historical Model

.STEP
Free
Harpoon Sailboat Bailers Wood Core Rebuild Tool
MARINE · HARPOON SAILBOAT

Harpoon Sailboat Bailers Wood Core Rebuild Tool

.STEP
Free
Satellite Decentral Cleaning System for Industrial Applications
INDUSTRIAL DESIGN · SATELLITE DECENTRAL CLEANING SYSTEM

Satellite Decentral Cleaning System for Industrial Applications

.STEP
Free
Mooring Station Equipment for Container Vessel Berthing
MARINE · MOORING STATION

Mooring Station Equipment for Container Vessel Berthing

.STEP
Free
Industrial Component Model for Engineering Applications
MACHINE DESIGN · INDUSTRIAL COMPONENT

Industrial Component Model for Engineering Applications

.STEP
Free
Precision Engineered Hub for Mechanical Assemblies
MACHINE DESIGN · MECHANICAL HUB

Precision Engineered Hub for Mechanical Assemblies

.STEP
Free
SurfWEHD Wave Energy Harnessing Device for Renewable Power
ENERGY AND POWER · WAVE ENERGY

SurfWEHD Wave Energy Harnessing Device for Renewable Power

.STEP
Free
Triple Roller for Cable Laying in Manhole Corners
INDUSTRIAL DESIGN · TRIPLE ROLLER

Triple Roller for Cable Laying in Manhole Corners

.STEP
Free
XY Axis CNC Router Machine for 2D Plywood Cutting with Belt and Rack Pinion Drive
MACHINE DESIGN · XY AXIS CNC ROUTER

XY Axis CNC Router Machine for 2D Plywood Cutting with Belt and Rack Pinion Drive

.STEP