Bill of Materials
Every part in a Stringman Arpeggio, split between the anchors and the gripper. Prices are per unit at the batch sizes we buy in, so expect to pay more for single quantities. 3D printed parts are in the downloads.
| Part | Anchors | Gripper | Qty | Unit price | Per kit |
|---|---|---|---|---|---|
| DAMIAO DM-H6215 Brushless DC Hub Motor with Built-in Driver | 4 | 4 | $66.08 | $264.30 | |
| Raspberry Pi Camera Module 3 Normal | 2 | 2 | $29.25 | $58.50 | |
| Raspberry Pi 3A+ | 2 | 2 | $25.00 | $50.00 | |
| STS3215 smart servo | 2 | 2 | $21.55 | $43.09 | |
| 24V 5A power supply with 5.5mm x 2.5mm barrel connector | 2 | 2 | $19.70 | $39.40 | |
| Raspberry Pi Camera Module 3 Wide | 1 | 1 | $38.50 | $38.50 | |
| 32 GB microsd card | 2 | 1 | 3 | $10.80 | $32.40 |
| custom stringman anchor hat | 2 | 2 | $10.54 | $21.07 | |
| Custom Gripper Hat with IMU (JLPCB) | 1 | 1 | $15.75 | $15.75 | |
| outlet remote kit | 1 | 1 | $15.00 | $15.00 | |
| Raspberry Pi Zero 2W no header | 1 | 1 | $15.00 | $15.00 | |
| laser rangefinder TOF400C-VL53L1 | 1 | 1 | $6.43 | $6.43 | |
| 50lb braided fishing line (meters) super 8 slick v2 | 40 | 40 | $0.15 | $5.83 | |
| 2 line 5A slip ring 22mm src-22-0205a | 1 | 1 | $4.50 | $4.50 | |
| 30x30x7mm 4-wire PWM fan | 2 | 1 | 3 | $1.26 | $3.78 |
| Force Sensing resistor FSR1610251 | 1 | 1 | $2.94 | $2.94 | |
| FEP cable 2 core 2mm OD | 7 | 7 | $0.40 | $2.82 | |
| Finger drive gear printed in Tough 1000 resin | 1 | 1 | $2.72 | $2.72 | |
| 10mm OD 27cm L carbon fiber tube | 1 | 1 | $2.67 | $2.67 | |
| 10x15x4 bearing | 1 | 1 | 2 | $1.20 | $2.40 |
| small carabiner | 4 | 4 | $0.50 | $2.00 | |
| Box 20x14x6 | 1 | 1 | $1.96 | $1.96 | |
| 4x13x5 bearing 624ZZ (PGN Bearings) | 3 | 3 | $0.63 | $1.88 | |
| M3x8 screw | 42 | 8 | 50 | $0.04 | $1.84 |
| fingerboard grip tape (peices) | 4 | 4 | $0.39 | $1.54 | |
| rpi zero ribbon cable 8cm | 1 | 1 | $1.44 | $1.44 | |
| rangefinder cable - 4p stemma to 2.54 pitch cable 10cm | 1 | 1 | $1.10 | $1.10 | |
| Pole wire - 2 core 26 awg with jst-zh female at both ends | 1 | 1 | $1.10 | $1.10 | |
| Alconite Rings Size 20 | 2 | 2 | $0.46 | $0.91 | |
| JST-ZH 2P plug with 10cm tail (male and female pair) | 1 | 1 | $0.90 | $0.90 | |
| M2.5x6 screw | 10 | 7 | 17 | $0.04 | $0.68 |
| 14x14x6 heatsink | 2 | 4 | 6 | $0.10 | $0.60 |
| M4x12 screw | 3 | 1 | 4 | $0.10 | $0.38 |
| M2.5x18 screw | 4 | 4 | $0.06 | $0.25 | |
| M2x4 screw | 8 | 4 | 12 | $0.02 | $0.24 |
| 3/8 * 7/8 stainless steel washer 1mm thickness | 1 | 2 | 3 | $0.08 | $0.24 |
| M3 lock nut | 6 | 6 | $0.04 | $0.24 | |
| M3x25 screw | 6 | 6 | $0.04 | $0.24 | |
| M4 washer | 8 | 8 | $0.02 | $0.16 | |
| 2p JST sh cable 15cm tails for pressure sense | 1 | 1 | $0.16 | $0.16 | |
| M3 washer | 4 | 4 | $0.04 | $0.16 | |
| M3x14 screw | 4 | 4 | $0.04 | $0.16 | |
| M2.5x16 screw | 3 | 3 | $0.04 | $0.12 | |
| M3x6 screw with countersunk head | 1 | 1 | $0.08 | $0.08 | |
| 6 pins of straight 2.54 header | 4 | 4 | $0.02 | $0.08 | |
| 1cm peice of 1cm ABS tube | 1 | 1 | $0.01 | $0.01 | |
| Total | $645.57 |
This table is generated from bill_of_materials.csv in the open source firmware repo, which also has batch sizes and batch prices. Raw CSV.