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
Flexible Toroidal Element Coupling for Shafts 16-20mm
MACHINE DESIGN · FLEXIBLE TOROIDAL ELEMENT COUPLING

Flexible Toroidal Element Coupling for Shafts 16-20mm

.STEP
Free
Maintenance Shield for Industrial Applications
INDUSTRIAL DESIGN · MAINTENANCE SHIELD

Maintenance Shield for Industrial Applications

.STEP
Free
SHO-70 Standard 0.4 kV Electrical Substation
ELECTRICAL · SHO-70

SHO-70 Standard 0.4 kV Electrical Substation

.STEP
Free
Precision Mechanical Component CAD Model
MACHINE DESIGN · PRECISION COMPONENT

Precision Mechanical Component 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
Vacuum Breaker Construction Component
CONSTRUCTION · VACUUM BREAKER

Vacuum Breaker Construction Component

.STEP
Free
SCED Terminal Blocks TR-16N-01-5P and TR-6N-01-4P
ELECTRICAL · TERMINAL BLOCK

SCED Terminal Blocks TR-16N-01-5P and TR-6N-01-4P

.STEP
Free
Rigid Chain Coupling CAD Model for Mechanical Power Transmission
MACHINE DESIGN · RIGID CHAIN COUPLING

Rigid Chain Coupling CAD Model for Mechanical Power Transmission

.STEP
Free
Shell and Tube Oil Cooler for Hydraulic Systems with Two-Pass Design
INDUSTRIAL DESIGN · SHELL AND TUBE OIL COOLER

Shell and Tube Oil Cooler for Hydraulic Systems with Two-Pass Design

.STEP
Free
Rotary Table with Electric Drive PDW16F for Precision Positioning
MACHINE DESIGN · ROTARY TABLE

Rotary Table with Electric Drive PDW16F for Precision Positioning

.STEP
Free
TR100 and TR60 Series Industrial Components
INDUSTRIAL DESIGN · TR100-01-BM0-N4-2P

TR100 and TR60 Series Industrial Components

.STEP
Free
Hydraulic Scissor Lift for Heavy-Duty Applications
INDUSTRIAL DESIGN · HYDRAULIC SCISSOR LIFT

Hydraulic Scissor Lift for Heavy-Duty Applications

.STEP
Free
Brass Barbed Hose Fitting with Dual Ferrules for 3/8 Inch ID Hose
INDUSTRIAL DESIGN · BRASS HOSE FITTING

Brass Barbed Hose Fitting with Dual Ferrules for 3/8 Inch ID Hose

.STEP
Free
Worm Gear Motor with Brake GV SHYB-RT 0.4kW Mitsubishi Electric
MACHINE DESIGN · WORM GEAR MOTOR

Worm Gear Motor with Brake GV SHYB-RT 0.4kW Mitsubishi Electric

.STEP
Free
60K TYZ AC Motor Industrial Component
MACHINE DESIGN · 60K TYZ

60K TYZ AC Motor Industrial Component

.STEP
Free
3/4 Inch Hex Brass Cap with 3/8 Inch MNPT and FNPT Threads
INDUSTRIAL DESIGN · 3/4 INCH HEX BRASS CAP

3/4 Inch Hex Brass Cap with 3/8 Inch MNPT and FNPT Threads

.STEP
Free
M8 Flanged Nut with Precise Dimensions CAD Model
MACHINE DESIGN · M8 FLANGED NUT

M8 Flanged Nut with Precise Dimensions CAD Model

.STEP
Free
2.2kW Worm Gear Motor Series GV SHYP by Mitsubishi Electric
MACHINE DESIGN · 2.2KW

2.2kW Worm Gear Motor Series GV SHYP by Mitsubishi Electric

.STEP
Free
Linear Actuator with Lateral Servo Motor XNTD55 BL-200
MACHINE DESIGN · LATERAL SERVO MOTOR

Linear Actuator with Lateral Servo Motor XNTD55 BL-200

.STEP
Free
310A Power Distribution Block by Marathon PN 1403404
ELECTRICAL · POWER DISTRIBUTION BLOCK

310A Power Distribution Block by Marathon PN 1403404

.STEP
Free
24V AC 1:1 Isolation Transformer 40VA for Electrical Applications
ELECTRICAL · 24V AC

24V AC 1:1 Isolation Transformer 40VA for Electrical Applications

.STEP
Free
Hydraulic Gear Pump Engineering Design
MACHINE DESIGN · HYDRAULIC GEAR PUMP

Hydraulic Gear Pump Engineering Design

.STEP
Free
240 sqmm Cable Lug Connector for Electrical Applications
ELECTRICAL · 240 SQMM CABLE LUG

240 sqmm Cable Lug Connector for Electrical Applications

.STEP