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
V6 Turbo Hybrid Engine 90 Degree 1.6L No Cam Design
AUTOMOTIVE · V6 TURBO HYBRID ENGINE

V6 Turbo Hybrid Engine 90 Degree 1.6L No Cam Design

.STEP
Free
Dual Output Electrical Transformer with Moderate Current Capacity
ELECTRICAL · DUAL OUTPUT TRANSFORMER

Dual Output Electrical Transformer with Moderate Current Capacity

.STEP
Free
Electrical Transformer for AC Power Transfer
ELECTRICAL · ELECTRICAL TRANSFORMER

Electrical Transformer for AC Power Transfer

.STEP
Free
Worm Geared Motor with Encoder FlexLink HUES Q11 480
MACHINE DESIGN · WORM GEARED MOTOR

Worm Geared Motor with Encoder FlexLink HUES Q11 480

.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
Linear Guides JVT 1-35 and JVT 1-35A for Precision Motion
MACHINE DESIGN · LINEAR GUIDES

Linear Guides JVT 1-35 and JVT 1-35A for Precision Motion

.STEP
Free
Elastic Coupling with Bolted Flange Connection
MACHINE DESIGN · ELASTIC COUPLING

Elastic Coupling with Bolted Flange Connection

.STEP
Free
Duct Flap Gate System CAD Model for Industrial Applications
INDUSTRIAL DESIGN · DUCT FLAP GATE

Duct Flap Gate System CAD Model for Industrial Applications

.STEP
Free
16sqmm 90 Degree Angle Cable Lug for Electrical Connections
ELECTRICAL · 16SQMM

16sqmm 90 Degree Angle Cable Lug for Electrical Connections

.STEP
Free
25sqmm 90 Degree Angle Cable Lug
ELECTRICAL · 25SQMM

25sqmm 90 Degree Angle Cable Lug

.STEP
Free
35sqmm 90 Degree Angle Cable Lug
ELECTRICAL · 35SQMM

35sqmm 90 Degree Angle Cable Lug

.STEP
Free
90 Degree Angle Cable Lug for 50 sqmm Cables
ELECTRICAL · 90 DEGREE ANGLE

90 Degree Angle Cable Lug for 50 sqmm Cables

.STEP
Free
90 Degree Angle Cable Lug for 75 sqmm Cable
ELECTRICAL · 90 DEGREE ANGLE CABLE LUG

90 Degree Angle Cable Lug for 75 sqmm Cable

.STEP
Free
90 Degree Angle Cable Lug for 120sqmm Cables
ELECTRICAL · 90 DEGREE ANGLE CABLE LUG

90 Degree Angle Cable Lug for 120sqmm Cables

.STEP
Free
90 Degree Angle Cable Lug for 185 sqmm Cable
ELECTRICAL · 90 DEGREE ANGLE CABLE LUG

90 Degree Angle Cable Lug for 185 sqmm Cable

.STEP
Free
90 Degree Angle Cable Lug for 240 sqmm Cables
ELECTRICAL · 90 DEGREE ANGLE CABLE LUG

90 Degree Angle Cable Lug for 240 sqmm Cables

.STEP
Free
90 Degree Angle Cable Lug for 300 sqmm Cables
ELECTRICAL · 90 DEGREE ANGLE

90 Degree Angle Cable Lug for 300 sqmm Cables

.STEP
Free
90 Degree Angle Cable Lug for 400 sqmm Cables
ELECTRICAL · 90 DEGREE ANGLE CABLE LUG

90 Degree Angle Cable Lug for 400 sqmm Cables

.STEP
Free
Four Bolt Flange Mounted Ball Bearing with Cast Iron Housing
MACHINE DESIGN · FOUR BOLT FLANGE

Four Bolt Flange Mounted Ball Bearing with Cast Iron Housing

.STEP
Free
Unbalanced Mechanical Component
MACHINE DESIGN · UNBALANCED COMPONENT

Unbalanced Mechanical Component

.STEP
Free
45-Degree Angled Cable Lug for 6 sqmm Wire
ELECTRICAL · 45-DEGREE ANGLED CABLE LUG

45-Degree Angled Cable Lug for 6 sqmm Wire

.STEP
Free
Household Electrical Outlet Cover Assembly Instructions
ELECTRICAL · ELECTRICAL OUTLET COVER

Household Electrical Outlet Cover Assembly Instructions

.STEP
Free
Battery Box Compatible with HYTERA PD4XX, PD5XX, and PD6XX Series Radios
ELECTRICAL · BATTERY BOX

Battery Box Compatible with HYTERA PD4XX, PD5XX, and PD6XX Series Radios

.STEP