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
3.4m High Fixed Ladder CAD Model with Detailed Material List
CONSTRUCTION · FIXED LADDER

3.4m High Fixed Ladder CAD Model with Detailed Material List

.STEP
Free
Yacht Class T 800 Design Overview
MARINE · YACHT CLASS T 800

Yacht Class T 800 Design Overview

.STEP
Free
Precision Casting Valve Designed in CAD Software
INDUSTRIAL DESIGN · PRECISION CASTING

Precision Casting Valve Designed in CAD Software

.STEP
Free
Yamaha 300 Outboard Engine CAD Model
MARINE · YAMAHA 300

Yamaha 300 Outboard Engine CAD Model

.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
Two-Block Tractor-Rescue Crews for Polar Drilling Platforms
MARINE · TWO-BLOCK TRACTOR

Two-Block Tractor-Rescue Crews for Polar Drilling Platforms

.STEP
Free
Detailed Ship Hull Model for Hydrodynamic Analysis
MARINE · SHIP HULL

Detailed Ship Hull Model for Hydrodynamic Analysis

.STEP
Free
High-Speed Patrol Catamaran with Independent Hull Suspension
MARINE · HIGH-SPEED PATROL CATAMARAN

High-Speed Patrol Catamaran with Independent Hull Suspension

.STEP
Free
Floating Garbage and Oil Waste Collector for Lake Environments
INDUSTRIAL DESIGN · FLOATING GARBAGE COLLECTOR

Floating Garbage and Oil Waste Collector for Lake Environments

.STEP
Free
Symmetric Four-Leg Sling Assembly for Lifting Applications
INDUSTRIAL DESIGN · FOUR-LEG SLING

Symmetric Four-Leg Sling Assembly for Lifting Applications

.STEP
Free
Cannon Mechanical Component CAD Model
MACHINE DESIGN · CANNON

Cannon Mechanical Component CAD Model

.STEP
Free
Bearing Shell for Shaft Mechanisms | Precision Bearing Component
MACHINE DESIGN · BEARING SHELL

Bearing Shell for Shaft Mechanisms | Precision Bearing Component

.STEP
Free
Marine Grade Touchscreen Monitor with PCAP Technology and High Brightness
MARINE · MARINE GRADE

Marine Grade Touchscreen Monitor with PCAP Technology and High Brightness

.STEP
Free
Internal Coin Support Structure for Multi-Level Ship Hull
MARINE · INTERNAL COIN SUPPORT

Internal Coin Support Structure for Multi-Level Ship Hull

.STEP
Free
Dimensional Accurate Oil Filler Plug Model
MACHINE DESIGN · OIL FILLER PLUG

Dimensional Accurate Oil Filler Plug Model

.STEP
Free
Jetski Jet and Propeller Components for Marine Engineering
MARINE · JETSKI

Jetski Jet and Propeller Components for Marine Engineering

.STEP
Free
14 Inch 3D Printable Sailboat Model with Removable Keel and Motorized Propulsion
MARINE · 14 INCH SAILBOAT

14 Inch 3D Printable Sailboat Model with Removable Keel and Motorized Propulsion

.STEP
Free
Centrifugal Pump Featuring Hardened Shaft for Enhanced Durability
INDUSTRIAL DESIGN · CENTRIFUGAL PUMP

Centrifugal Pump Featuring Hardened Shaft for Enhanced Durability

.STEP
Free
LEGO Compatible Brick Model with iMates and Part Numbering
INDUSTRIAL DESIGN · LEGO-COMPATIBLE

LEGO Compatible Brick Model with iMates and Part Numbering

.STEP
Free
Common Structural Components Used in Shipbuilding
MARINE · STRUCTURAL COMPONENTS

Common Structural Components Used in Shipbuilding

.STEP
Free
Gear Pump Body CAD Model for Engineering Applications
MACHINE DESIGN · GEAR PUMP BODY

Gear Pump Body CAD Model for Engineering Applications

.STEP
Free
Passenger Hovercraft Skeg Type Barguzin for Baikal Lake
MARINE · PASSENGER HOVERCRAFT

Passenger Hovercraft Skeg Type Barguzin for Baikal Lake

.STEP
Free
Tugboat ASD Model Without Gears and Steering
MARINE · TUGBOAT ASD

Tugboat ASD Model Without Gears and Steering

.STEP