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
Multi-Pitch Propeller Compatible with Flipsky 65161 and Maytech 65162
AVIATION · MULTI PITCH PROP

Multi-Pitch Propeller Compatible with Flipsky 65161 and Maytech 65162

.STEP
Free
3D Model of a Chess King Piece - CAD Design Tutorial
3D PRINTING · CHESSPIECE

3D Model of a Chess King Piece - CAD Design Tutorial

.STEP
Free
Decagonal Trapezohedron Polyhedron Model
3D PRINTING · DECAGONAL TRAPEZOHEDRON

Decagonal Trapezohedron Polyhedron Model

.STEP
Free
ER 32 Collet Holder for Precision Tooling
MACHINE DESIGN · ER 32 HOLDER

ER 32 Collet Holder for Precision Tooling

.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
AC Remote Holder - Secure and Convenient Storage Solution
3D PRINTING · AC REMOTE HOLDER 2

AC Remote Holder - Secure and Convenient Storage Solution

.STEP
Free
3D Printable Enclosure for STM Nucleo 144 Series Development Board
ELECTRICAL · ENCLOSURE

3D Printable Enclosure for STM Nucleo 144 Series Development Board

.STEP
Free
3D Printable Bass Guitar Pickguard Model
INDUSTRIAL DESIGN · BASS PICKGUARD 1

3D Printable Bass Guitar Pickguard Model

.STEP
Free
FreeCAD 1.0 Modeling Tutorial
MACHINE DESIGN · EXERCISE FREECAD 019 1

FreeCAD 1.0 Modeling Tutorial

.STEP
Free
FreeCAD 1.0 Modeling Tutorial
MACHINE DESIGN · EXERCISE FREECAD 020 1

FreeCAD 1.0 Modeling Tutorial

.STEP
Free
Reinforced Beater Blade for Magimix XL 42 5200
INDUSTRIAL DESIGN · MAGIMIX XL 42 5200

Reinforced Beater Blade for Magimix XL 42 5200

.STEP
Free
M2188 Quartz Clock Model for Design Projects
INDUSTRIAL DESIGN · M2188

M2188 Quartz Clock Model for Design Projects

.STEP
Free
Canadian Utility Box Model - 1-7/8 in. Deep, 16.5 cu. in. Capacity
ELECTRICAL · UTILITY BOX

Canadian Utility Box Model - 1-7/8 in. Deep, 16.5 cu. in. Capacity

.STEP
Free
Aluminum Cube with Floating Ball CNC Machining Model
MACHINE DESIGN · FLOATING BALL IN A BOX 1

Aluminum Cube with Floating Ball CNC Machining Model

.STEP
Free
Mono Audio Jack Connector with Precise Pin Spacing
ELECTRICAL · JACK AUDIO MONO CONNECTOR

Mono Audio Jack Connector with Precise Pin Spacing

.STEP
Free
MR. Cement and TAMIYA Cement Holder 3D Model
INDUSTRIAL DESIGN · MR CEMENT TAMIYA CEMENT HOLDER 1

MR. Cement and TAMIYA Cement Holder 3D Model

.STEP
Free
Manufacturing Fixture for Process Efficiency
MACHINE DESIGN · JIG

Manufacturing Fixture for Process Efficiency

.STEP
Free
3D Printable Sleeve for Vortec V900 Seatpost and Handlebar
3D PRINTING · VORTEC V900

3D Printable Sleeve for Vortec V900 Seatpost and Handlebar

.STEP
Free
3D Printable SSD and HDD Storage Rack for Desktop Computers
INDUSTRIAL DESIGN · SSD

3D Printable SSD and HDD Storage Rack for Desktop Computers

.STEP
Free
Simple Board for Organizing Lego Bricks
INDUSTRIAL DESIGN · LEGO BOARD 1

Simple Board for Organizing Lego Bricks

.STEP
Free
152mm Omni Wheel for Multi-Directional Movement in Robotics and Automation
ROBOTICS · OMNI WHEEL

152mm Omni Wheel for Multi-Directional Movement in Robotics and Automation

.STEP
Free
High Precision Pulley Wheel for Mechanical Drive Systems
MACHINE DESIGN · PULLEY 50T 1

High Precision Pulley Wheel for Mechanical Drive Systems

.STEP
Free
3D Printable Plastic Actuator Replacement Model
MACHINE DESIGN · CTS 442 ACTUATOR

3D Printable Plastic Actuator Replacement Model

.STEP