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.

All3D PrintingAerospaceArchitectureAutomotiveAviationChemicalConstructionElectricalEnergy And PowerIndustrial DesignJewelleryMachine designMarineMedicalMiscellaneousRobotics
10,000+ models2D drawings
Sort by:
Free
Piston and Crankshaft Assembly Model
AUTOMOTIVE · PISTON MONTAJ 1

Piston and Crankshaft Assembly Model

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
220 mm Floating Brake Disc for Pitbike
AUTOMOTIVE · 220MM FLOATING BRAKE DISC

220 mm Floating Brake Disc for Pitbike

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
Detailed Lego Corvette Model for CAD Enthusiasts
INDUSTRIAL DESIGN · LEGO 10321 1

Detailed Lego Corvette Model for CAD Enthusiasts

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
Foldable Mobility Scooter with Removable Seat and Folding Tiller
MEDICAL · FOLDABLE MOBILITY SCOOTER

Foldable Mobility Scooter with Removable Seat and Folding Tiller

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview

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
CPU Fan Motor Assembly for Efficient Cooling
MACHINE DESIGN · CPU FAN

CPU Fan Motor Assembly for Efficient Cooling

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
Durable Aluminum Vehicle Ramps Rated for 2800 kg Load
AUTOMOTIVE · ALUMINUM VEHICLE RAMPS

Durable Aluminum Vehicle Ramps Rated for 2800 kg Load

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview

Browse CAD models by file format

STEP CAD modelsSTL CAD modelsIGES CAD modelsOBJ 3D modelsPLY modelsDWG drawingsDXF drawings

Browse CAD models by category

Automotive CAD modelsAerospace CAD modelsRobotics CAD models3D printing CAD modelsArchitecture CAD modelsIndustrial design CAD modelsMedical CAD modelsElectrical CAD models
Free
Dust Extraction Machine Design
MACHINE DESIGN · THI T K MAY HUT B I 1

Dust Extraction Machine Design

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
Engine Combustion System Model Featuring Crankshaft and Piston Mechanism
AUTOMOTIVE · ENGINE COMBUSTION SYSTEM

Engine Combustion System Model Featuring Crankshaft and Piston Mechanism

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
Professional Spanner Design 17/13
MACHINE DESIGN · SPANNER 17 13 1

Professional Spanner Design 17/13

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
F1 Front Wing Design Inspired by 2012 Model
AUTOMOTIVE · F1 FRONT WING 20

F1 Front Wing Design Inspired by 2012 Model

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
4 Stroke Piston Model with Motion Simulation
MACHINE DESIGN · 4 STROKE PISTON

4 Stroke Piston Model with Motion Simulation

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
Formula 4 Car Wheel Rim Design
AUTOMOTIVE · WHEEL RIM 196

Formula 4 Car Wheel Rim Design

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
350Z Manual Transmission Throw Out Bearing and Sleeve for DE Engine
AUTOMOTIVE · 350Z

350Z Manual Transmission Throw Out Bearing and Sleeve for DE Engine

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
Toyota Hilux Fuel Tank Accessories Overview
AUTOMOTIVE · FUEL FILL CAP

Toyota Hilux Fuel Tank Accessories Overview

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
Car Upright Knuckle Inspired by FSAE Steering System
AUTOMOTIVE · CAR UPRIGHT

Car Upright Knuckle Inspired by FSAE Steering System

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
Crankshaft 3D Model for Engineering and Design
MACHINE DESIGN · CRANKSHAFT 399

Crankshaft 3D Model for Engineering and Design

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
Torx Head Screws ISO14582 M3 and M4 Sizes
MACHINE DESIGN · TORX SCREW

Torx Head Screws ISO14582 M3 and M4 Sizes

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
Tyre Modeling Tutorial for Beginners in Autodesk Inventor
AUTOMOTIVE · TYRE

Tyre Modeling Tutorial for Beginners in Autodesk Inventor

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
Filling and Ultrasonic Welding System for Plastic Tubes
MACHINE DESIGN · FILLING SYSTEM

Filling and Ultrasonic Welding System for Plastic Tubes

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
Steering System CAD Model for Engineering Design
AUTOMOTIVE · STEERING 15

Steering System CAD Model for Engineering Design

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
Aftermarket Pulley for 2JZ Alternator with Precise Dimensions
AUTOMOTIVE · 2JZ BILLET ALTERNATOR PULLEY

Aftermarket Pulley for 2JZ Alternator with Precise Dimensions

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
Free
Piaggio Vespa Brake Lever CAD Model
AUTOMOTIVE · BRAKE LEVER

Piaggio Vespa Brake Lever CAD Model

.STEP
Open STEP file viewerConvert STEP to STL
<100 downloads
Preview
prev...190191192193194...next
Marathon OS logoThe CAD marketplace for modern teams
HomeAbout usWhy us?Contact us
Tools3D to 2D Drawing Pipeline3D CAD Viewer3D CAD File Converter
Library
Hire CAD Designers
Production-ready in 24 hrs
👤
→
2D Library
Ask a question
Privacy Policy|Terms of Service|Refund Policy|
© Marathon 2025 All Rights Reserved