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.

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
10,000+ models2D drawings
Sort by:
Free
T Elbow Hammer CAD Model for Engineering and Design
INDUSTRIAL DESIGN · T ELBOW HAMMER

T Elbow Hammer CAD Model for Engineering and Design

.STEP
Free
Creality WIFI Smart Kit 2.0 with Ball Pin Mount for 3D Printers
3D PRINTING · CREALITY WIFI SMART KIT 2.0

Creality WIFI Smart Kit 2.0 with Ball Pin Mount for 3D Printers

.STEP
Free
Hadex HY-M284 Solid State Relay with 2 Channels
ELECTRICAL · HADEX HY-M284

Hadex HY-M284 Solid State Relay with 2 Channels

.STEP
Free
Ergonomic Computer Mouse CAD Model with Sleek Design
INDUSTRIAL DESIGN · ERGONOMIC MOUSE

Ergonomic Computer Mouse CAD Model with Sleek Design

.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
10-Inch Touchscreen Laptop for Raspberry Pi 5
INDUSTRIAL DESIGN · 10-INCH TOUCHSCREEN LAPTOP

10-Inch Touchscreen Laptop for Raspberry Pi 5

.STEP
Free
Arduino Shield for Project Integration and Development
ELECTRICAL · ARDUINO SHIELD

Arduino Shield for Project Integration and Development

.STEP
Free
Mounting Bracket for Support Structures
INDUSTRIAL DESIGN · MOUNTING BRACKET

Mounting Bracket for Support Structures

.STEP
Free
Simulation Report Analysis for Engineering Applications
MACHINE DESIGN · SIMULATION

Simulation Report Analysis for Engineering Applications

.STEP
Free
2x16 Character LCD Display Module for Development Boards
ELECTRICAL · LCD DISPLAY MODULE

2x16 Character LCD Display Module for Development Boards

.STEP
Free
PVC Drain for Isopor Boxes - Industrial Drainage Component
CONSTRUCTION · PVC DRAIN

PVC Drain for Isopor Boxes - Industrial Drainage Component

.STEP
Free
PVC Drain Cover for Isopor Boxes - Durable Industrial Component
INDUSTRIAL DESIGN · PVC DRAIN COVER

PVC Drain Cover for Isopor Boxes - Durable Industrial Component

.STEP
Free
Sphenocorona Johnson Solid Polyhedron Model
SPHENOCORONA

Sphenocorona Johnson Solid Polyhedron Model

.STEP
Free
Optimized Mechanical Component Design
MACHINE DESIGN · MECHANICAL COMPONENT

Optimized Mechanical Component Design

.STEP
Free
Compact Mecanum Drivetrain Assembly for FTC Robotics
ROBOTICS · MECANUM DRIVETRAIN

Compact Mecanum Drivetrain Assembly for FTC Robotics

.STEP
Free
3D Printable Bearing Cover for Mechanical Assemblies
MACHINE DESIGN · BEARING COVER

3D Printable Bearing Cover for Mechanical Assemblies

.STEP
Free
Professional CAD Model for Engineering Drawings
MACHINE DESIGN · ENGINEERING DRAWINGS

Professional CAD Model for Engineering Drawings

.STEP
Free
Ribbon Mixer Cap for 200 KG Industrial Mixers
CHEMICAL · RIBBON MIXER CAP

Ribbon Mixer Cap for 200 KG Industrial Mixers

.STEP
Free
Intricate Pyramidal Abstract Sculpture Design with Open Corridors
ARCHITECTURE · PYRAMIDAL SCULPTURE

Intricate Pyramidal Abstract Sculpture Design with Open Corridors

.STEP
Free
Infrared Tachometer Module with Digital and Analog Output
ROBOTICS · INFRARED TACHOMETER

Infrared Tachometer Module with Digital and Analog Output

.STEP
Free
60 ml Volume Container CAD Model
INDUSTRIAL DESIGN · 60 ML CONTAINER

60 ml Volume Container CAD Model

.STEP
Free
Standard Tailstock Dial with Depth Indication
MACHINE DESIGN · TAILSTOCK DIAL

Standard Tailstock Dial with Depth Indication

.STEP
Free
Reinforced Coffee Dosing Spoon 3D Model
3D PRINTING · COFFEE DOSING SPOON

Reinforced Coffee Dosing Spoon 3D Model

.STEP