3D Printable Prosthetic Hand

Myo-Electric Prosthetic
Hand — Parts Catalog

Browse all 34 3D-printable STL components for an open-source myo-electric prosthetic hand. Each part has an interactive 3D viewer — rotate, zoom, toggle wireframe, and download the STL directly.

34

STL Parts

7

Categories

5

Finger Types

∞

Prints Possible

🦾 View Full Assembly All 34 parts assembled · S / M / L / XL sizes · Exploded view →

☞

Fingers — Index Index Finger Assembly (3 segments)

Index Finger — Base Segment

Proximal Phalanx with Cutout Joint

Base segment connecting to the palm. Features cutout joint interface for cable-driven flexion and snap-fit assembly with the middle segment.

STL Proximal Index Finger 3D Print

Index Finger — Middle Segment

Intermediate finger segment with hinge joint channels. Connects base to tip with tendon routing grooves for servo-actuated flexion.

STL Middle Index Finger 3D Print

Index Finger — Tip

Fingertip unit with grip surface and tendon anchor point. Terminal segment that makes contact with objects during grasp.

STL Distal Index Finger 3D Print

🖐️

Fingers — Middle Middle Finger Assembly (3 segments)

Middle Finger — Base Segment

Proximal Phalanx with Cutout Joint

Base bone of the middle finger with palm-interface cutout. Longest proximal phalanx in the hand assembly.

STL Proximal Middle Finger 3D Print

Middle Finger — Middle Segment

Intermediate segment with PIP hinge channels and dual tendon routing grooves for cable-driven actuation.

STL Middle Middle Finger 3D Print

Middle Finger — Tip

Terminal fingertip of the middle digit. Features grip contact surface and tendon termination anchor.

STL Distal Middle Finger 3D Print

💍

Fingers — Ring Ring Finger Assembly (3 segments)

Ring Finger — Base Segment

Proximal Phalanx with Cutout Joint

Ring finger base with palm socket cutout. Slightly shorter than the middle finger proximal segment.

STL Proximal Ring Finger 3D Print

Ring Finger — Middle Segment

Intermediate ring finger segment with hinge joint sockets and tendon cable routing channels.

STL Middle Ring Finger 3D Print

Ring Finger — Tip

Ring fingertip with grip pad surface. Completes the ring finger kinematic chain for grasp function.

STL Distal Ring Finger 3D Print

🤙

Fingers — Pinky Pinky Finger Assembly (3 segments)

Pinky Finger — Base Segment

Proximal Phalanx with Cutout Joint

Smallest proximal segment. Connects to the ulnar side of the palm assembly with cutout pivot joint.

STL Proximal Pinky Finger 3D Print

Pinky Finger — Middle Segment

Small intermediate segment with tendon routing for cable-driven flexion. Matched to pinky proportions.

STL Middle Pinky Finger 3D Print

Pinky Finger — Tip

Smallest fingertip in the assembly. Completes the pinky finger chain for full hand grasp articulation.

STL Distal Pinky Finger 3D Print

👍

Fingers — Thumb Thumb Assembly (3 segments)

Thumb — Lower Segment

Proximal Phalanx

Thumb base connecting to the palm via the CMC joint interface. Thicker than finger proximals for opposition grip strength.

STL Proximal Thumb 3D Print

Thumb — Middle Segment

Intermediate thumb segment enabling opposition movement. Wider profile than finger middles for robust pinch grip.

STL Middle Thumb 3D Print

Thumb tip with wide grip pad. Critical for pinch and opposition functions in activities of daily living.

STL Distal Thumb 3D Print

✋

Palm Palm Assembly (2 parts)

Palm — Finger Cutouts Back

Dorsal Palm Assembly

Back plate of the palm with precision cutouts for all five finger base joints. Routes tendons from servos to each digit.

STL Palm Back Palm 3D Print

Palm — Optimised Connector

Palm Socket Interface

Optimised palm-to-forearm connector interface. Structural bridge between the hand assembly and the wrist/forearm section.

STL Connector Palm 3D Print

💪

Forearm & Wrist Forearm & Wrist Sections (7 parts)

Mid Forearm — Large Section

Main Forearm Tube (Large)

Larger half-shell of the mid-forearm housing. Contains servo motor mounts and cable routing channels for finger actuation.

STL Forearm Forearm 3D Print

Mid Forearm — Small Section

Main Forearm Tube (Small)

Smaller half-shell completing the mid-forearm enclosure. Clips together with the large section to house electronics.

STL Forearm Forearm 3D Print

Upper Forearm — Small

Upper Forearm Section (Small)

Small upper forearm panel section. Part of the multi-piece forearm shell that houses the NodeMCU and servo wiring.

STL Forearm Forearm 3D Print

Wrist Clearance A

Wrist Joint Clearance Part A

First clearance piece enabling wrist rotation freedom. Prevents cable binding during pronation/supination movement.

STL Wrist Wrist 3D Print

Wrist Clearance B

Wrist Joint Clearance Part B

Second clearance piece for wrist articulation. Pairs with Part A to form the wrist rotation interface cavity.

STL Wrist Wrist 3D Print

Wrist Forearm Section A

Wrist-to-Forearm Interface A

First half of the wrist-to-forearm structural bridge. Mounts to the forearm tube and provides the wrist rotation bearing surface.

STL Wrist Wrist 3D Print

Wrist Forearm Section B

Wrist-to-Forearm Interface B

Second half completing the wrist-forearm junction. Together with Section A forms the complete rotational wrist interface.

STL Wrist Wrist 3D Print

⚙️

Upper Forearm Upper Forearm Shell & Gearing (3 parts)

Forearm Gear Split

Split Gear Mechanism

Split gear assembly enabling forearm rotation. Meshes with elbow gearing for controlled pronation/supination transfer.

STL Gear Upper Forearm 3D Print

Upper Forearm — Large

Upper Forearm Shell (Large)

Larger half of the upper forearm housing. Provides structural support and encloses the upper servo bank and wiring harness.

STL Shell Upper Forearm 3D Print

Upper Forearm — Small

Upper Forearm Shell (Small)

Smaller matching half-shell of the upper forearm. Completes the enclosure with snap-fit or screw attachment to the large section.

STL Shell Upper Forearm 3D Print

🔐

Elbow Elbow Joint Mechanism (3 parts)

Elbow — Locking Pins

Joint Retention Pins

Precision locking pins for the elbow hinge. Holds the joint at set angles and provides the pivot axis for flexion/extension.

STL Pin Elbow 3D Print

Elbow — Pin Lock

Pin Lock Mechanism

Locking mechanism that secures the elbow pins in position. Provides stance-phase stability when the arm is loaded.

STL Lock Elbow 3D Print

Elbow — Small Gear

Gear Drive Component

Small gear in the elbow drive train. Provides mechanical advantage for servo-actuated elbow flexion and controlled movement speed.

STL Gear Elbow 3D Print

💪

Bicep Upper Arm Shell (2 parts)

Upper Arm Body Shell

Main bicep housing forming the upper arm structure. Encloses the battery, NodeMCU controller, and upper harness attachment points.

STL Shell Bicep 3D Print

Upper Bicep Cap

Shoulder-End Cap

Top cap closing the bicep shell at the shoulder end. Provides the shoulder harness interface and strain relief for wiring.

STL Cap Bicep 3D Print

🔩

Hardware Mechanical Hardware & Accessories (2 parts)

Horn — Servo Actuator

Servo Horn Linkage

Custom servo horn that connects the servo motor output shaft to the tendon cables. Provides the mechanical linkage for finger actuation.

STL Horn Hardware 3D Print

Locking Pins — Assembly

General Locking Pin Set

General-purpose locking pins used across multiple joints. Provides pivot axes and retention for snap-fit assemblies throughout the prosthetic.

STL Pin Hardware 3D Print

🦾 Project — 3D-Printed Myo-Electric Prosthetic Hand

🧠

Controller

NodeMCU (ESP8266)

⚡

Power

5V LIPO Battery

🔧

Actuators

Servo Motors

📐

CAD Software

Autodesk Fusion 360

🖨️

Slicer

Simplify3D

🔌

PCB Design

EasyEDA

📜

License

MIT Open Source

📁

File Format

STL (Binary & ASCII)