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
SMD Storage Box Designed for 1206 Components
ELECTRICAL · SMD STORAGE BOX

SMD Storage Box Designed for 1206 Components

.STEP
Free
Textured Matte Backdrop for Casio F-91W Backlight Enhancement
3D PRINTING · CASIO F-91W

Textured Matte Backdrop for Casio F-91W Backlight Enhancement

.STEP
Free
Dual Cam Shuffling Mechanism for Lightweight Robotics
ROBOTICS · DUAL CAM MECHANISM

Dual Cam Shuffling Mechanism for Lightweight Robotics

.STEP
Free
6-Inch to 4-Inch PVC Hose Adapter
INDUSTRIAL DESIGN · PVC HOSE ADAPTER

6-Inch to 4-Inch PVC Hose Adapter

.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
Dual Bevel Gear Fidget Spinner Keychain for Stress Relief
MACHINE DESIGN · DUAL BEVEL GEAR

Dual Bevel Gear Fidget Spinner Keychain for Stress Relief

.STEP
Free
CH-E3Dv6-Bowden Toolhead with E3Dv6 Hotend and BLTouch Sensor
3D PRINTING · CH-E3DV6-BOWDEN

CH-E3Dv6-Bowden Toolhead with E3Dv6 Hotend and BLTouch Sensor

.STEP
Free
KitchenAid Flat Blender Blade Earring 3D Model
JEWELLERY · KITCHENAID BLENDER BLADE

KitchenAid Flat Blender Blade Earring 3D Model

.STEP
Free
Robotic Basket Component for Automated Systems
ROBOTICS · ROBOTIC BASKET

Robotic Basket Component for Automated Systems

.STEP
Free
Rear Camera Phone Holder for Simultaneous Recording and Viewing
INDUSTRIAL DESIGN · PHONE HOLDER

Rear Camera Phone Holder for Simultaneous Recording and Viewing

.STEP
Free
ISO Corner Set for Industrial Applications
INDUSTRIAL DESIGN · ISO CORNER SET

ISO Corner Set for Industrial Applications

.STEP
Free
SolidWorks Designed Phone Case Assembly with Five Components
INDUSTRIAL DESIGN · PHONE CASE

SolidWorks Designed Phone Case Assembly with Five Components

.STEP
Free
Bracket Components for Toothpaste Glass Jar and Toothbrush
INDUSTRIAL DESIGN · BRACKET

Bracket Components for Toothpaste Glass Jar and Toothbrush

.STEP
Free
15 Degree Angled Connector for Honeycomb and Multiboard Systems
CONSTRUCTION · 15 DEGREE CONNECTOR

15 Degree Angled Connector for Honeycomb and Multiboard Systems

.STEP
Free
Disposal Box and Blade Storage Solution for Honeycomb Wall and Multiboard
INDUSTRIAL DESIGN · DISPOSAL BOX

Disposal Box and Blade Storage Solution for Honeycomb Wall and Multiboard

.STEP
Free
Smartphone Stand CAD Model for Technical and Industrial Use
INDUSTRIAL DESIGN · SMARTPHONE STAND

Smartphone Stand CAD Model for Technical and Industrial Use

.STEP
Free
3D CAD Model of Laundry Basket for Industrial Design
INDUSTRIAL DESIGN · LAUNDRY BASKET

3D CAD Model of Laundry Basket for Industrial Design

.STEP
Free
Porcelain Cup with Handle CAD Model
INDUSTRIAL DESIGN · PORCELAIN CUP

Porcelain Cup with Handle CAD Model

.STEP
Free
Industrial Component Model
MACHINE DESIGN · INDUSTRIAL COMPONENT

Industrial Component Model

.STEP
Free
Tripod Stand CAD Model for Engineering and Design
INDUSTRIAL DESIGN · TRIPOD STAND

Tripod Stand CAD Model for Engineering and Design

.STEP
Free
Quadlock Adaptor for GoPro and Front Bike Light
AUTOMOTIVE · QUADLOCK ADAPTOR

Quadlock Adaptor for GoPro and Front Bike Light

.STEP
Free
Adjustable Vintage Industrial Spotlight Model
INDUSTRIAL DESIGN · ADJUSTABLE SPOTLIGHT

Adjustable Vintage Industrial Spotlight Model

.STEP
Free
Taipan Antweight Battlebot with Dual Configurations for Competitive Robotics
ROBOTICS · TAIPAN

Taipan Antweight Battlebot with Dual Configurations for Competitive Robotics

.STEP