MK0M focuses on developing an advanced fully mechanical design that maintains a high functionality whilst maintaining ease of assembly. All major parts can be printed in PLA with no supports, and with little to no post print processing required. Assembly takes around 15-30 mins with around 23 printed parts needed for the hand.
ARX MK0 Variants
- MK0 - https://hackaday.io/project/167785
Main variant which focuses on a bringing a fairly advanced low cost robotics hand that's compact in design.
- MK0S - https://hackaday.io/project/169583
Servo variant which focuses on being an easy to develop robotic hand using standard servos which can be easily sourced and controlled
- MK0F - https://hackaday.io/project/173565
Figure variant which is non motorised and static design. Mainly focused for artistic uses such as in stop motion, display purposes, sketching, etc.
Currently, many available 3D printed mechanical prosthetic devices struggle to maintain a balance of functionality, aesthetics, and ease of printing with FDM technology. Some designs may bring a fully 3D printed that's easy to print and assemble but lack a more human aesthetic. Other designs may have the human aesthetic but have difficulties in making it easy for printing. ARX Hand Project hopes to bring a better balanced design to the community with a futuristic humanoid prosthetic design that's been heavily optimised for easy printing using FDM technology. Many new and unique 3D printing design techniques have also been introduced to help aid in assembly together with better functionality.
- Fully mechanical design
- Can be printed in with PLA or PETG
- Easy to print - No supports needed nor any fancy materials to be printed
- Easy to assemble - Roughly 15-30 mins to assemble without the need for drilling, tapping or part cleanup
- Materials are easy to source - Uses common screws, fishing line, elastic cord and 3D printer filament
- Maintain good balance of functionality, aesthetics, and ease of assembly and printing
- Design is durable and is capable of withstanding impacts, drops and long term use
- Able to assist with lifting and grasping of objects - Able to lift 8kg
The design brings 4 actuating fingers with a manually adjustable thumb. Design uses a whippletree style of actuation to allow for each closing finger to be independent of one another for better adaptability when grasping. in addition to the whippletree, an integrated pulley system is used to provide a configurable 2 or 3 times greater mechanical advantage for better grasping strength. Cord opening and additional screw holes are added to the back side to allow for motors or extra parts to be mounted if needed. Hand parts can be printed using any printer capable of printing PLA, and can be printed with or without supports. Additional materials required are some self tapping screws, 1.75mm & 2.85mm/3mm nylon filament, 1mm diameter elastic cord and 0.5mm to 0.8mm diameter braided fishing line.
- V3.4 Finger Design
V3.4 builds on top of the initial design for V3 finger design. The aesthetic design remains the same, but many optimizations have been made to the design to improve overall printabilty and assembly.
Subtle features have been added within the model to reduce effects of 3D printing imperfections from impacting the fitting of joints. Rounding to edges have been added to reduce overshooting artefacts on surfaces from ghosting, ringing and nozzle pressure build up. Seam adjustments have been added to avoid seams being placed between joint surfaces. Clearances on the joints are still fairly lenient to allow for easier printing, but clearances may be reduced down to 0.1mm if required.
For a two joint finger, fingers require the use of 1.75mm and 2.85mm/3mm nylon filament to act as pins between joints. Nylon should ideally be used as it provides a low friction, low wear joint. The flexibility of nylon also...