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
HDPE Two-Way Nasal Inhaler 3D Assembly Model
MEDICAL · HDPE

HDPE Two-Way Nasal Inhaler 3D Assembly Model

.STEP
Free
Scientific Medical Research Device with Microclimate Control
MEDICAL · MICROCLIMATE CONTROL

Scientific Medical Research Device with Microclimate Control

.STEP
Free
Ashoka Chakra Design Model
JEWELLERY · ASHOKA CHAKRA

Ashoka Chakra Design Model

.STEP
Free
Spiral Microchannel Designs for Inertial Microfluidic Cell Separation
MEDICAL · SPIRAL MICROCHANNEL

Spiral Microchannel Designs for Inertial Microfluidic Cell Separation

.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
Non-Surgical Laser Device for Subcutaneous Fat Removal
MEDICAL · NON-SURGICAL LASER DEVICE

Non-Surgical Laser Device for Subcutaneous Fat Removal

.STEP
Free
Set of Three Light Glasses for Pharmaceutical Pressure Vessels
CHEMICAL · PHARMACEUTICAL

Set of Three Light Glasses for Pharmaceutical Pressure Vessels

.STEP
Free
ASME BPE Standard Fittings for Pharmaceutical and Food Industry Piping
CHEMICAL · ASME BPE

ASME BPE Standard Fittings for Pharmaceutical and Food Industry Piping

.STEP
Free
Dual Syringe Assembly for Precision Fluid Dispensing
MEDICAL · DUAL SYRINGE ASSEMBLY

Dual Syringe Assembly for Precision Fluid Dispensing

.STEP
Free
Reusable Small Volume Liquid Medicine Packaging with Tamper-Evident Seal
MEDICAL · LIQUID MEDICINE PACKAGING

Reusable Small Volume Liquid Medicine Packaging with Tamper-Evident Seal

.STEP
Free
Horizontal Shell and Tube Heat Exchanger with 1 Inch Tube-Side Inlet and 75cm Tubes
ENERGY AND POWER · HEAT EXCHANGER

Horizontal Shell and Tube Heat Exchanger with 1 Inch Tube-Side Inlet and 75cm Tubes

.STEP
Free
Aluminum Radiator 20x20x6 cm for Cooling Applications
MACHINE DESIGN · ALUMINUM RADIATOR

Aluminum Radiator 20x20x6 cm for Cooling Applications

.STEP
Free
Medical Equipment Component
MEDICAL · MEDICAL EQUIPMENT

Medical Equipment Component

.STEP
Free
Medical Equipment Component CAD Model
MEDICAL · MEDICAL EQUIPMENT

Medical Equipment Component CAD Model

.STEP
Free
Medical Equipment Component for Healthcare Applications
MEDICAL · MEDICAL EQUIPMENT

Medical Equipment Component for Healthcare Applications

.STEP
Free
Medical Equipment Component for Healthcare Applications
MEDICAL · MEDICAL EQUIPMENT

Medical Equipment Component for Healthcare Applications

.STEP
Free
Ergonomic Walking Stick Design for Enhanced User Comfort
MEDICAL · ERGONOMIC DESIGN

Ergonomic Walking Stick Design for Enhanced User Comfort

.STEP
Free
Laboratory Rocker Machine CAD Model for Precise Sample Mixing
CHEMICAL · LABORATORY ROCKER MACHINE

Laboratory Rocker Machine CAD Model for Precise Sample Mixing

.STEP
Free
Steripot Laboratory Glass Bead Sterilizer for Rapid Instrument Sterilization
MEDICAL · STERIPOT

Steripot Laboratory Glass Bead Sterilizer for Rapid Instrument Sterilization

.STEP
Free
10 Inch Liquid Filter Housing with 1 Inch Ports for Industrial Filtration
INDUSTRIAL DESIGN · LIQUID FILTER HOUSING

10 Inch Liquid Filter Housing with 1 Inch Ports for Industrial Filtration

.STEP
Free
3ft Horizontal Laminar Flow Biosafety Cabinet for Laboratory Use
MEDICAL · LAMINAR FLOW CABINET

3ft Horizontal Laminar Flow Biosafety Cabinet for Laboratory Use

.STEP
Free
6-Foot Vertical Laminar Flow Biosafety Cabinet for Laboratory and Industrial Use
MEDICAL · 6-FOOT VERTICAL LAMINAR FLOW BIOSAFETY CABINET

6-Foot Vertical Laminar Flow Biosafety Cabinet for Laboratory and Industrial Use

.STEP
Free
Four Wheel Drive Transmission System for SAE BAJA Racing Vehicles
AUTOMOTIVE · FOUR-WHEEL DRIVE

Four Wheel Drive Transmission System for SAE BAJA Racing Vehicles

.STEP