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
ETC Component CAD Model
MACHINE DESIGN · ETC COMPONENT

ETC Component CAD Model

.STEP
Free
ETC Industrial Component CAD Model
INDUSTRIAL DESIGN · ETC COMPONENT

ETC Industrial Component CAD Model

.STEP
Free
ETC Component CAD Model
MACHINE DESIGN · ETC COMPONENT

ETC Component CAD Model

.STEP
Free
SIMCOM GSM GPRS Communication Module
ELECTRICAL · SIMCOM GSM GPRS MODULE

SIMCOM GSM GPRS Communication Module

.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
Professional SolidWorks CAD Model
MACHINE DESIGN · 3D MODEL

Professional SolidWorks CAD Model

.STEP
Free
Openffboard Based Direct Drive Wheelbase for DIY Projects
ROBOTICS · OPENFFBOARD

Openffboard Based Direct Drive Wheelbase for DIY Projects

.STEP
Free
3D Model of Bearing Component
MACHINE DESIGN · BEARING

3D Model of Bearing Component

.STEP
Free
Pulley Motor Assembly 3D Model for Mechanical Systems
MACHINE DESIGN · PULLEY MOTOR ASSEMBLY

Pulley Motor Assembly 3D Model for Mechanical Systems

.STEP
Free
Nikon 500mm f/8 Reflex-NIKKOR Lens Model
INDUSTRIAL DESIGN · NIKON 500MM F/8 REFLEX-NIKKOR

Nikon 500mm f/8 Reflex-NIKKOR Lens Model

.STEP
Free
Phone Stand Accessory for Secure Device Placement
INDUSTRIAL DESIGN · PHONE STAND

Phone Stand Accessory for Secure Device Placement

.STEP
Free
Circuit Board CAD Model for Engineering Demonstration
ELECTRICAL · CIRCUIT BOARD

Circuit Board CAD Model for Engineering Demonstration

.STEP
Free
Model 3 Engineering Design
AUTOMOTIVE · MODEL 3

Model 3 Engineering Design

.STEP
Free
Plastic Bottle Recycling Filament for 3D Printing
3D PRINTING · PLASTIC BOTTLE RECYCLING

Plastic Bottle Recycling Filament for 3D Printing

.STEP
Free
Detailed Elegoo Filament Spool CAD Model
3D PRINTING · ELEGOO

Detailed Elegoo Filament Spool CAD Model

.STEP
Free
3D CAD Model for Engineering Applications
MACHINE DESIGN · 3D CAD MODEL

3D CAD Model for Engineering Applications

.STEP
Free
FL SUN SR Industrial 3D Printer Model
3D PRINTING · FL SUN SR

FL SUN SR Industrial 3D Printer Model

.STEP
Free
Industrial Lamp Component for Engineering Applications
INDUSTRIAL DESIGN · INDUSTRIAL LAMP

Industrial Lamp Component for Engineering Applications

.STEP
Free
Intamsys Funmat HT Hotend Assembly CAD Model
3D PRINTING · INTAMSYS FUNMAT HT

Intamsys Funmat HT Hotend Assembly CAD Model

.STEP
Free
Water Bottle CAD Model for Industrial Design
INDUSTRIAL DESIGN · WATER BOTTLE

Water Bottle CAD Model for Industrial Design

.STEP
Free
HEMA Hanwei Tinker Longsword with Custom Quillon and Pommel
JEWELLERY · HEMA

HEMA Hanwei Tinker Longsword with Custom Quillon and Pommel

.STEP
Free
Industrial Component with Partial Variations and Full Functionality
MACHINE DESIGN · INDUSTRIAL COMPONENT

Industrial Component with Partial Variations and Full Functionality

.STEP
Free
Husqvarna Model Representation
MACHINE DESIGN · HUSQVARNA

Husqvarna Model Representation

.STEP