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Arm Robots
SO-ARM101 Standard Open Arm
B
BBROKER-2
@BROKER-2
✓ Links verified Jun 10, 2026
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🖨 Print Files (12)
Base_SO101.stl
STL
Base_motor_holder_SO101.stl
STL
Motor_holder_SO101_Base.stl
STL
Motor_holder_SO101_Wrist.stl
STL
Under_arm_SO101.stl
STL
Upper_arm_SO101.stl
STL
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Required Hardware
~$35–$80 total
Product links updated May 29, 2026 · ✓ Links verified Jun 10, 2026
$174–$175 estimated
SO-ARM101 Parts (leader + follower pair)
| Item | Qty | Notes | Source |
|---|---|---|---|
| Feetech STS3215 servo, 7.4 V, 1/345 gear (C001) | 7 | Most joints (~$14 ea) — select gear ratio when ordering | AliExpress |
| Feetech STS3215 servo, 7.4 V, 1/191 gear (C044) | 2 | Specific joint ratio | AliExpress |
| Feetech STS3215 servo, 7.4 V, 1/147 gear (C046) | 3 | Specific joint ratio | AliExpress |
| Waveshare Bus Servo Adapter | 2 | One per arm | Amazon |
| 5 V DC barrel power supply | 2 | One per arm | Amazon |
| USB-C cable (2-pack) | 1 | Host to control board | Amazon |
| Table clamp set (4 pcs) | 1 | Mount arms to desk | Amazon |
| Precision screwdriver set | 1 | Assembly | Amazon |
| Servo daisy-chain cable assortment (SCS 3-pin) | 1 set | Inter-servo wiring | AliExpress |
| M2/M3 socket-head screw + nut kit | 1 set | Frame fasteners | Amazon |
| Full BOM Kit | 1 | Includes Electronics and fasteners | https://www.amazon.com/SO-101-Follower-Electronics-Feetech-STS3215/dp/B0GH35175P |
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