mechanical design CAD Models

Browse mechanical design CAD models used in real projects. Preview online and download STEP/STP, IGES, STL and more. Filter by category, file type, price and popularity.

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.

7 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.

5 partspairs verified
HARDWARE

Metric Fasteners & Threaded Hardware Pack

A reusable ISO/metric fastener library cluster with screws, nuts, washers, inserts, standoffs and bolt assemblies.

2 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.

7 partspairs verified
ELECTRONICS PROTOTYPING

Arduino / ESP32 Prototyping Kit

A maker electronics cluster with Arduino, ESP32, breadboard, shield, servo, battery holder and enclosure.

7 partspairs verified
ROBOTICS

Robotic Arm + Gripper Kit

A robotic manipulator cluster with 6-DOF arm, gripper, wrist, servo mounts, actuator and linear guide components.

7 partspairs verified
CNC MACHINING

CNC Workholding & Tooling Kit

A CNC machining cluster covering table, clamping, vise, chuck, collet holder, spindle and ball-screw motion.

6 partspairs verified
HVAC / DUCTING

HVAC Ventilation Duct Assembly Kit

A ventilation product cluster with grille, damper, duct adapter, fan, filter, flange and duct clamp.

6 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.

8 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.

9 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.

7 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.

5 partspairs verified
1390 models2D drawings
Sort by:
Free
V6 Engine Valve CAD Model
AUTOMOTIVE · V6 ENGINE

V6 Engine Valve CAD Model

.STEP
Free
Traditional V8 Engine Prototype Model
AUTOMOTIVE · V8 ENGINE

Traditional V8 Engine Prototype Model

.STEP
Free
Crankshaft Assembly CAD Model for Engineering Practice
MACHINE DESIGN · CRANKSHAFT

Crankshaft Assembly CAD Model for Engineering Practice

.STEP
Free
Motorcycle Conversion Motor Mount Design for Institutional Project
AUTOMOTIVE · MOTOR MOUNT

Motorcycle Conversion Motor Mount Design for Institutional Project

.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
Motorcycle Drive Chain CAD Model for Mechanical Design
AUTOMOTIVE · MOTORCYCLE DRIVE CHAIN

Motorcycle Drive Chain CAD Model for Mechanical Design

.STEP
Free
3D Engine Assembly Model Rendered Image
AUTOMOTIVE · ENGINE ASSEMBLY

3D Engine Assembly Model Rendered Image

.STEP
Free
Dummy Piston Head CAD Model for Engine Testing and Prototyping
AUTOMOTIVE · PISTON HEAD 135

Dummy Piston Head CAD Model for Engine Testing and Prototyping

.STEP
Free
Scissor Jack Design for Versatile Lifting Applications
MACHINE DESIGN · MAKASLI KRIKO 1

Scissor Jack Design for Versatile Lifting Applications

.STEP
Free
4 Stroke Piston Model with Motion Simulation
MACHINE DESIGN · 4 STROKE PISTON

4 Stroke Piston Model with Motion Simulation

.STEP
Free
Steering System CAD Model for Engineering Design
AUTOMOTIVE · STEERING 15

Steering System CAD Model for Engineering Design

.STEP
Free
OB7-PG2 Robotic Gripper for OB7 Robotic Arms
ROBOTICS · ROBOTIC GRIPPER

OB7-PG2 Robotic Gripper for OB7 Robotic Arms

.STEP
Free
Gruebler's Count 3D Mechanism Design Model for Durable Machines
AEROSPACE · LE F 111

Gruebler's Count 3D Mechanism Design Model for Durable Machines

.STEP
Free
Delivery Robot Model for Efficient Logistics
ROBOTICS · DELIVERY ROBOT

Delivery Robot Model for Efficient Logistics

.STEP
Free
Mecanum Wheel CAD Model for Omnidirectional Mobility
ROBOTICS · MECAUNUM WHEEL 1

Mecanum Wheel CAD Model for Omnidirectional Mobility

.STEP
Free
Detailed 3D Model of HP 16 Engine for Engineering Insights
MACHINE DESIGN · HP 16 ENGINE MODEL 1

Detailed 3D Model of HP 16 Engine for Engineering Insights

.STEP
Free
15cc Flat Twin Model Aircraft Engine Design
MACHINE DESIGN · 15CC FLAT TWIN 1

15cc Flat Twin Model Aircraft Engine Design

.STEP
Free
Switchblade Wing Mechanism Sample with Extension Springs
AEROSPACE · SWITCHBLADE WING MECHANISM

Switchblade Wing Mechanism Sample with Extension Springs

.STEP
Free
3U CubeSat Deployer with Motorized Door and Magnetic Clamp Mechanism
AEROSPACE · CUBESAT DEPLOYER 1

3U CubeSat Deployer with Motorized Door and Magnetic Clamp Mechanism

.STEP
Free
Upper Assembly Component for Design Reference
MACHINE DESIGN · AAP01 UPPER ASSEMBLY 1

Upper Assembly Component for Design Reference

.STEP
Free
Moving Drum Bed for Conveyor System Tensioning
INDUSTRIAL DESIGN · MOVING DRUM BED 1

Moving Drum Bed for Conveyor System Tensioning

.STEP
Free
RC Car Suspension Model for Design and Engineering
AUTOMOTIVE · RC CAR SUSPENSION 3

RC Car Suspension Model for Design and Engineering

.STEP
Free
4 POM Wheel Gantry CAD Model for Mechanical Design
MACHINE DESIGN · 4 WHEEL GANTRY

4 POM Wheel Gantry CAD Model for Mechanical Design

.STEP