Open Source RoboticsRobots, software & learning

Star Arm 102-LD

Robot / hardware build
Teleoperation

Fashion Star 6+1 joint leader arm with published 102-LD parts, drawings and a reBot B601 teleoperation route; hardware reuse rights remain unresolved. [1]

Build & first use →Official websiteUpstream build guideBill of materials

For
Builders and labs assembling a leader arm; Developers pairing it with a B601 follower [1]
Cost
No current cost yet. Upstream bill of materials [2]
Source rights
Some licenses are unresolved. Review licenses

Source researched · Not tested by us
Sources checked · Research details

Licenses & related hardware
License
Apache-2.0 · license not fully assessed for mechanical design, documentation · Details by part

Requirements · Research details and dates

On this page

Overview

The Star Arm 102-LD is a hand-guided 6-joint arm with a gripper input. In the Seeed reBot workflow it supplies joint positions to a B601 follower; it is a separate piece of hardware, not a second B601 variant. Fashion Star's repository identifies several 102 models, so use the hardware/102-ld/ files when assessing this leader configuration. [1] [2] [4]

Is this for you?

Use cases
  • Leader input for reBot B601 teleoperation
  • Demonstration collection

[1] [4]

Known limitations
  • Repository-wide hardware and documentation reuse rights are unresolved.
  • BOM lacks a sourced total and print settings; physical pairing has not been tested by OSR.
  • The LD/HD URDF marks joint5 fixed despite a six-arm-joint hardware description; clarify model scope before kinematic validation.

[2] [3] [4] [1] [5]

What you need

Operating system
  • Ubuntu 22.04 for the documented direct Python and ROS 2 routes

[4]

Host computer

Linux host for the documented LeRobot/reBot pairing; direct Python and ROS 2 routes have separate version requirements.

[4]

Dependencies
  • Seven specified Fashion Star UART bus servos
  • 12 V supply and USB-UART adapter
  • A compatible follower and host for teleoperation

[2] [4]

Tools
  • 3D printer for listed printed parts
  • Assembly tools and USB-UART adapter

Editorial inference from the cited source; no runtime verification.

[2] · Editorial assessment

Skills
  • 3D printing and mechanical assembly
  • UART serial setup and calibration

Editorial inference from the cited source; no runtime verification.

[2] [4] · Editorial assessment

Hardware & parts

Upstream bill of materials [2]

Hardware configuration

6 arm joints plus gripper input, 102-LD leader configuration.

[1] [2]

Actuators
  • Four RA8-U01H-M
  • One RA8-U02H-M
  • Two RA8-U03H-M UART bus servo/encoder modules; BOM describes no-torque-output input joints

[2]

Controller

Host reads leader joint positions over UART; specific follower control depends on the selected integration.

[2] [4]

Power

12 V / 3 A leader supply in the manufacturer overview; follower supply is separate.

Applies to 102-LD only.

[1]

Degrees of freedom

7

Six arm joints plus gripper input; not seven arm axes.

[1] [2]

Assembly & first use

Open the upstream getting-started guide [1] · Project documentation [2]

  • Choose the 102-LD variant and inspect its 29-item BOM and STEP/STL files.
  • Print/fabricate the listed parts and assemble using the linked guide.
  • Connect the UART leader, calibrate it, then follow the version-matched reBot pairing guide.

Editorial inference from the cited source; no runtime verification.

[2] [4] · Editorial assessment

Assembly

102-LD page links an assembly guide and publishes STEP, STL and drawing resources for the variant.

[2]

Calibration

Set the leader zero pose with the chosen LeRobot integration; do not reuse calibration across different plugin generations.

[4]

Cost

No current, complete configuration-specific build cost has been established for this profile.

3D preview

Preview not available yet. The pinned leader-arm repository includes STEP and STL design files, but an assembly matching the 102-LD configuration and permission to host its geometry have not been confirmed.

Model sources

The pinned leader-arm repository includes STEP and STL design files, but an assembly matching the 102-LD configuration and permission to host its geometry have not been confirmed.

Project notes

What is available for a 102-LD build

The 102-LD page lists 29 assembly items and links a STEP assembly, individual STEP/STL parts, dimensioned drawings, a URDF and an assembly guide. Its BOM names four RA8-U01H-M, one RA8-U02H-M and two RA8-U03H-M UART servo/encoder modules. Print settings are not supplied; the guide leaves slicing choices to the builder. The parts list and geometry support an inspection or build attempt, but they do not establish a current complete purchase total or a verified first-working setup. [2] [5]

For teleoperation, the 102-LD BOM names a UC-01 USB-UART adapter, and the manufacturer's overview specifies 12 V / 3 A power for this leader. The B601 follower, host and its supply must be scoped through the selected reBot pairing guide. The compatibility guide distinguishes direct Python, two generations of LeRobot integration and ROS 2. It warns that the LeRobot packages use different device types and action keys, and that calibration files should not be swapped between them. [1] [2] [4]

The supplied LD/HD URDF marks joint5 as fixed, although the overview describes six movable arm joints plus gripper input. That is a model-file discrepancy to clarify before using this URDF for kinematic validation; it does not establish that the physical leader lacks the joint. [1] [5]

What we checked

Source research only; no printed part inspection, hardware build, calibration or teleoperation test. No affiliate links or reused media.

Updates

Upstream last updated
Oct 21, 2026 [1]
Latest release
Not established
Profile updated
Oct 21, 2026
Sources last checked
Oct 21, 2026
Next review
Nov 21, 2026
Reviewed revision
49341c3 · combined hardware and software repository

Source files and licenses

A distinct teleoperation device with inspectable LD mechanical source and BOM. Hardware/documentation license grant is unresolved; describe source access without claiming fully open hardware.

LayerAvailability / license
mechanical designavailable · License not fully assessed
STEP/STL, drawings and URDF exist; no established hardware reuse license. [2] [3]
electronicsnot found · License not fully assessed
BOM names purchased UART servos and adapter; no custom board design was identified in the inspected 102-LD directory. [2] [3]
firmwarenot found · License not fully assessed
Servo firmware source was not identified in the inspected 102-LD directory. [2] [3]
softwareavailable · Apache-2.0
Apache applies to the named release-compatible leader plugin, not the whole repository. [3] [4]
documentationavailable · License not fully assessed
Public documentation; repository-wide reuse grant unresolved. [2] [3]

This hardware/software contribution does not publish this artifact type.

Rights and verification limits

The repository's LICENSE.md grants Apache-2.0 terms to named release-compatible plugins but explicitly says a consistent license for the hardware files and most documentation has not been established. The design files are accessible; their presence alone does not give a clear right to redistribute them. We therefore describe this as a source-available hardware reference and link to the original files rather than republishing its models or images. No 102-LD was fabricated, calibrated or paired with a B601 by Open Source Robotics. [2] [3] [4]

References

Each source links to the exact revision we read. “Used for” shows where this page relies on it.

  • S001 Star Arm 102 project overview
    Identifies LD leader variant, 6+1 arm, documentation and hardware directories.
    Revision, date & where cited

    Fashion Star / Star Arm contributors · github.com · revision 49341c3 · README.md at · Accessed Oct 21, 2026


    Used for: Overview, Is this for you?, Hardware & parts, Assembly & first use and 2 more
  • S002 102-LD hardware files and BOM
    Lists 29 assembly items, STEP/STL files, drawings and URDF; print settings are not specified.
    Revision, date & where cited

    Fashion Star / Star Arm contributors · github.com · revision 49341c3 · hardware/102-ld/README.md at · Accessed Oct 21, 2026


    Used for: Overview, Is this for you?, What you need, Hardware & parts and 3 more
  • S003 License scope
    Says hardware files and most documentation lack a consistent repository-wide license grant; separately identifies licensed plugins.
    Revision, date & where cited

    Fashion Star / Star Arm contributors · github.com · revision 49341c3 · LICENSE.md at · Accessed Oct 21, 2026


    Used for: Is this for you?, Source files and licenses
  • S004 Version and integration boundaries
    Separates direct Python, LeRobot plugin generations, ROS 2 and reBot pairing; warns calibration and package identities are not interchangeable.
    Revision, date & where cited

    Fashion Star / Star Arm contributors · github.com · revision 49341c3 · docs/compatibility.md at · Accessed Oct 21, 2026


    Used for: Overview, Is this for you?, What you need, Hardware & parts and 3 more
  • S005 102-LD source URDF
    Robot description source for the LD/HD configuration; not a complete manufacturing design by itself.
    Revision, date & where cited

    Fashion Star / Star Arm contributors · github.com · revision 49341c3 · hardware/102-ld/robot-description/stararm102-ld-hd-description/urdf/stararm102_ld_hd_description.urdf at · Accessed Oct 21, 2026


    Used for: Is this for you?, What is available for a 102-LD build

Correction guidance · Discussion is not enabled · Profile format 0.7.0-draft.5

Change history

2026-10-21 — Created from Seeed reBot course discovery; pinned source research only.