Video can be found here: https://www.youtube.com/watch?v=Qu_x8T9408U

STL and Fusion 360 source files can be found here: https://bbprojects.technology/collections/stl-fusion-360-source-files/products/robot-hand-bionic-hand-prosthesis-prototype

This bionic hand is controlled by an arduino nano V3 and uses 4 15kg servo's to move the index, middel, ring and little finger and 3 9g servo's to rotate the thumb and pull the tumb and the fingers open. This bionic hand it's structure is modelled after my hand so I could make a gel10 mold that would fit snug around it. I originally wanted to integrate some force feedback in the finger tips by using some small pushbuttons but that didn't turn out to well because the wires from the pushbuttons in combination with the gel10 mold caused to much friction in the joints of the fingers and the fingers had to push to hard to activate the pushbuttons. I'm now going to do some tests with currentsensors so I can messure the current going to the servo's and when the current goes above the normal level then the servo's would stop (that's the idea).

More info can be found here: https://hackaday.io/project/102439-robot-hand-bionic-hand-prosthesis-prototype

Components used:

4 × 15kg Servo's link: https://www.banggood.com/MG995-High-Torgue-Mental-Gear-Analog-Servo-p-73885.html?rmmds=search&cur_warehouse=CN

1 × 2.54mm Single Row Male Pin Header Strip For Arduino link: https://www.banggood.com/10-Pcs-40-Pin-2_54mm-Single-Row-Male-Pin-Header-Strip-For-Arduino-p-918427.html?rmmds=search&cur_warehouse=CN

2 × 9g servo's link: https://www.banggood.com/TowerPro-SG90-Mini-Gear-Micro-Servo-9g-For-RC-Airplane-Helicopter-p-1009914.html?p=E01411629100201406T1&custlinkid=359550

1 × arduino nano V3 link: https://www.banggood.com/Geekcreit-ATmega328P-Nano-V3-Module-Improved-Version-With-USB-Cable-Development-Board-For-Arduino-p-933647.html?p=E01411629100201406T1&custlinkid=255135

1 × DC-DC Step Down Adjustable Constant Voltage Current Power Supply Module link: https://www.banggood.com/LM2596-DC-DC-Verstellbar-Step-Down-Schaltregler-Power-Supply-Module-p-88252.html?p=E01411629100201406T1&custlinkid=255154

1 × 2S lipo 7.4V link: https://www.banggood.com/7_4V-2S-2000mAh-8C-Lipo-Battery-Compatible-for-Frsky-ACCST-Taranis-Q-X7-Transmitter-p-1249125.html?p=E01411629100201406T1&custlinkid=669244

2 × 5mm red LED link: https://www.banggood.com/Geekcreit-375pcs-3MM-5MM-LED-Light-Emitting-Diode-Beads-Resistance-Lights-Kits-Bulb-Lamp-p-1027601.html?p=E01411629100201406T1&custlinkid=669272

2 × pushbutton link: https://www.banggood.com/100pcs-Mini-Micro-Momentary-Tactile-Tact-Switch-Push-Button-DIP-P4-Normally-Open-p-917570.html?p=E01411629100201406T1&custlinkid=669260

2 × 200 ohm resistor link: https://www.banggood.com/Wholesale-Geekcreit-600pcs-30-Kinds-Value-1-14W-Metal-Film-Resistor-Assorted-Kit-20pcs-Each-Value-p-53320.html?rmmds=search&cur_warehouse=CN

3 × springs from old pens

1 × 1mm diameter steel rod or similar as shafts for the fingers

1 × nylon wire

1 × somewhat larger spring but less stiff as the springs from the pens this spring brings the thumb back to it's original position. I just used one I had lying around and I thought was gonna work

Recommended Tools:

3D-printer: https://www.banggood.com/Creality-3D-Ender-3-Pro-V-slot-Prusa-I3-DIY-3D-Printer-Kit-p-1346320.html?p=E01411629100201406T1&custlinkid=677427

Paypal: https://paypal.me/BrockenBrian

Feel free to take a look at my other designs:

3D printable antweight battlebot: Bulldog: https://www.thingiverse.com/thing:4623536 SpaceX inspired edf rocket: https://www.thingiverse.com/thing:4606751 3D printed high torque servo/gearbox version 2: https://www.thingiverse.com/thing:4547703 UMC - Universal motion controller: https://www.thingiverse.com/thing:4245315 3D-printable Davinci catapult gift card: https://www.thingiverse.com/thing:4067668 Arduino controlled photogrammetry 3D-scanner: https://www.thingiverse.com/thing:3958326 Fully 3D-printable turntable: https://www.thingiverse.com/thing:3723618 RC FPV tank rover: https://www.thingiverse.com/thing:3587738 Fully 3D-printable wind-up car gift card: https://www.thingiverse.com/thing:3308710 3D-printable High torque servo/gear reduction: https://www.thingiverse.com/thing:3292860 'BOOM box' high voltage capacitor bank case: https://www.thingiverse.com/thing:2980012 Subby the interactive youtube subscriber robot: https://www.thingiverse.com/thing:2928254 robot hand || bionic hand prosthesis prototype: https://www.thingiverse.com/thing:2838239 3D-printable linear actuator: https://www.thingiverse.com/thing:2783959 Mini 3D-printable crossbow: https://www.thingiverse.com/thing:2710472 8 legged spider robot: https://www.thingiverse.com/thing:2470882 best 3D-printable bearing: https://www.thingiverse.com/thing:2349065

Have a nice day!