Here is the open-source documentation page for you to assemble your arm! In these documents, you can find detailed assembly instructions and respective BOM’s for our 1-motor and 2-motor prostheses. Feel free to contact us for a CAD file with your exact dimensions or to send you an electrical hardware kit as part of your assembly.
One-Motor Design Documentation
| Item Name | Quantity | Source |
|---|---|---|
| Upper Index/Ring Finger | 2 | 3D printed |
| Upper Middle Finger | 1 | 3D printed |
| Upper Pinkie Finger | 1 | 3D printed |
| Lower Finger | 3 | 3D printed |
| Lower Pinkie | 1 | 3D printed |
| Palm | 1 | 3D printed |
| Knuckle Joint Pin | 3 | 3D printed |
| Pinkie Knuckle Joint Pin | 1 | 3D printed |
| 0.086” non-springback wire | 1 spool | McMaster Carr ID: 9495K71 |
| Braided Fishing Line - 30lb, 0.28mm | 1 spool | Any commercially available brand |
| Wrist Piece | 1 | 3D printed |
| Forearm Case | 1 | 3D printed |
| Forearm Lid | 1 | 3D printed |
| M4 x 30 mm screw | 2 | McMaster Carr ID: 91290A172 |
| M4 Hex Nut | 3 | McMaster Carr ID: 91828A23 |
| M4 x 35 mm screw | 1 | McMaster Carr ID: 91290A173 |
| Brass Heat-Set Insert | 4 | McMaster Carr ID: 94459A120 |
| Type 316 Stainless Steel Flat Washer | 4 | McMaster Carr ID: 901070A003 |
| M2 x 6 mm Screw (Alloy Steel Low-Profile Socket Head Screw) | 4 | McMaster Carr ID: 93070A276 |
| 18-8 Stainless Steel Binding Barrel and Screw | 2 | McMaster Carr ID: 99637A311 |
| Tricep Attachment | 1 | 3D printed |
| Cuff | 1 | 3D printed |
Two-Motor Design Documentation
| Item Name | Quantity | Source |
|---|---|---|
| Upper Index Finger | 1 | 3D printed |
| Upper Middle Finger | 1 | 3D printed |
| Upper Ring Finger | 1 | 3D printed |
| Upper Pinkie Finger | 1 | 3D printed |
| Lower Finger | 3 | 3D printed |
| Lower Pinkie | 1 | 3D printed |
| Palm | 1 | 3D printed |
| Knuckle Joint Rivet | 3 | 3D printed |
| Pinkie Knuckle Joint Rivet | 1 | 3D printed |
| 0.086” non-springback wire | 1 spool | McMaster Carr ID: 9495K71 |
| Braided Fishing Line - 30lb, 0.28mm | 1 spool | Any commercially available brand |
| Wrist Piece | 1 | 3D printed |
| Forearm Case | 1 | 3D printed |
| Forearm Lid | 1 | 3D printed |
| M4 x 40 mm screw | 4 | McMaster Carr ID: 91290A174 |
| M2 Heat Set Threaded Insert | 8 | McMaster Carr ID: 94459A120 |
| M2 x 6 mm Screw | 8 | McMaster Carr ID: 93070A276 |
| Square Plug | 1 | McMaster Carr ID: 9565K500 |
| No. 2 Washer | 8 | McMaster Carr ID: 901070A003 |
| M4 Hex Nut | 4 | McMaster Carr ID: 91828A231 |
| Chicago Screw | 2 | McMaster Carr ID: 99637A313 |
| Tricep Attachment | 1 | 3D printed |
| Cuff | 1 | 3D printed |
Circuit Board Documentation
| Circuit Component/Tool | Quantity | Link(s)/Prices from Respective Links |
|---|---|---|
| Arduino Pro Mini (5V) | 1 | Adafruit: $9.95 NewEgg: $2.95 (+$3.99 shipping) = $6.93 AliExpress: $1.65 |
| FTDI Basic Breakout - 5V | 1 | Amazon: $16.95 eBay: $5.85 |
| Breakaway, Straight, Male to Male Pin Header (1 by 12) | 2 | PEConnectors: $0.14 * 2 = $0.28. Minimum $20 order eBay: $2.15 (+$2.99 shipping) = $5.18 |
| Breakaway, Right Angle, Male to Male Pin Header (1 by 6) | 1 | SparkFun: $1.95 |
| Myoware Muscle Sensors | 1 | Adafruit: $37.95 |
| IRF540n MOSFET | 1 | Digi-Key: $1.30 eBay: $0.99 |
| Trackstar TS-D99X Servo Motor | 1 | HobbyKing: $19.22 |
| Bolt 500mAh 7.6V Lipo Battery | 1 | HobbyKing: $4.54 |
| UBEC 5V DC/DC Step-Down Voltage Regulator | 1 | Adafruit: $9.95 |
| 12 inch Servo Motor Connecter Wires | 3 | Amazon (30cm; 10pc): $9.39 |
| 4 inch 2 Pin Female Plug Connector | 1 | Amazon (20pc): $7.49 Adafruit: $0.75 *3 = $2.25 |
| Double Sided, 4x6 Protoboard | 1 | Amazon (10pc): $6.99 eBay (3pc): $3.00 AliExpress (5pc): $0.66 |
| Slide Switch | 1 | Amazon (100pc): $9.99 Digi-Key: $0.65 x2 =$1.30 eBay: $3.20 |
| Soldering Iron w/ tools and solder | 1 | Amazon: $19.99 |
| Electrical Tape | 1 | Amazon: $7.92 |
| Helping Hands (optional, but VERY useful) | 1 | Amazon: $7.30 |
| Dremel | 1 | Amazon: $27.33 |
Prosthesis-User Interface Materials
| Part | Quantity | Link | Price (may be outdated) |
|---|---|---|---|
| Sleeve (thicker option) | 1 | Uflex Elbow Compression Sleeve | $13.99+tax for 1 |
| Sleeve (thinner option) | 1 | TekDeals Cooling Arm Sleeve | $6.99+tax for pair |
| Conductive Thread | 1 | Stainless Medium Conductive Thread - 3 ply | $12.96+tax for 18 meters |
| Finger Grips | 1 | Lee Tippi Microgel Fingertip Grips - Size 3 Extra Small | $10.99+tax for 10 |
| Surface EMG Electrodes | 1 | 3M 2560 Red Dot Multi-Purpose Monitoring Electrode | $13.66+tax for 100 |