ElRobot 7+1 DoF 3D-printed robot arm with wrist camera, clamped to a desk

ELROBOT · 3D-PRINTED · OPEN HARDWARE

430 mm REACH · ~800 g / ARM 7+1 DOF · LEADER + FOLLOWER

[ OPEN 7+1 DOF ARM PAIR · PHYSICAL AI ]

ElRobot.

Name: ElRobot Leader + Follower Pair
Brand: MakerMods
Price: 399 USD
Availability: PreOrder

A fully assembled leader + follower teleoperation pair for imitation-learning research. Skip ~30 hours of printing, sourcing 16 servos, and wiring. Move the leader, the follower mirrors, and you're collecting data out of the box.

$399 one leader + one follower · fully assembled pre-order · first batch

[ PRE-ORDER → ]

open hardware · stl / step / urdf public · feetech serial-bus servos

[ AT A GLANCE · 02 ]

From unboxing to teleop in minutes.

ElRobot is normally a ~30-hour DIY build. We print, assemble, wire, calibrate, and test every pair, so your first session is research, not soldering.

ElRobot arm extended upward with arm-mounted camera

01 · CAMERA

ElRobot arm folded, showing Feetech servos and wiring

02 · SERVOS

[ HW · 01 ]

7+1 DoF, 430 mm reach

One more joint than the SO-101's six, a fuller teleoperation workspace for manipulation research, at ~800 g per arm.

[ HW · 02 ]

Back-drivable leader

The leader runs low-voltage 7.4 V servos that move with minimal resistance, so demonstrations feel natural and precise.

[ HW · 03 ]

Standard, swappable servos

16 × Feetech STS3215 serial-bus servos across the pair. No proprietary hardware, swap any joint with an off-the-shelf part.

[ HW · 04 ]

Assembled & QC'd

Printed, wired, calibrated, and tested by MakerMods, a proven build with 10 units already delivered.

[ TELEOPERATION · 03 ]

Move the leader. The follower mirrors.

Record demonstrations by hand: guide the back-drivable leader and the follower reproduces every motion while both cameras capture the scene, the standard pipeline for imitation learning.

Operator moves the ElRobot leader arm by hand while two follower arms mirror the motion

[ 3.1 · LEADER + FOLLOWER ]

Teleop out of the box.

Both arms arrive paired and calibrated. Plug both into your laptop over USB, power them up, and the follower shadows the leader, no assembly, no servo ID flashing.

ElRobot arm teleoperated to pick an ice cube and drop it into a glass

[ 3.2 · DATA COLLECTION ]

Built to collect demonstrations.

Two USB cameras are included, one arm-mounted, one for the table view, so every demonstration is recorded from the viewpoints imitation-learning policies train on.

[ WHAT'S IN THE BOX · 04 ]

The complete teleop rig.

Everything to run leader-follower teleoperation and record demonstrations, the day it lands on your bench. Bring your own laptop.

Follower arm (assembled)

7+1 DoF, 8 × STS3215 12 V servos, calibrated and tested.

×1

Leader arm (assembled)

Back-drivable, 8 × STS3215 7.4 V servos for smooth teleop.

×1

Serial-bus servo driver

One per arm. Data over USB A-to-C, motor power external.

×2

Power supplies

12 V / 4 A for the follower, 7.5 V / 5 A for the leader. No battery.

×2

USB cameras

Arm-mounted + table-mounted views for data collection.

×2

USB A-to-C cables

One per arm, laptop data connection.

×2

[ PLUG IN · POWER UP · TELEOP ]

Assembled, calibrated, tested.

Ships fully assembled and paired. Clamp both bases to your bench, connect power and USB, and you're recording demonstrations within minutes.

Every pair calibrated and QC'd before shipping
10 units already built and delivered
Open design, STL / STEP / URDF public for spares
Foam-packed for international express

[ OPEN SOURCE · 05 ]

Every part on GitHub.

ElRobot is NormaCore's open hardware design. STL, STEP, Bambu / Orca print profiles, simulation files, and both assembly manuals are public, so you can print spares, repair any part, or mod the arm freely.

licenseApache 2.0
formatSTL · STEP · 3MF profiles · sim · manuals
designNormaCore (original ElRobot)
assembledby MakerMods

[ VIEW ON GITHUB → ] Download .zip

▣github.com/norma-core/norma-core

GitHub repository, norma-core/norma-core hardware/elrobot directory

open in github → Apache 2.0 license

[ SPECS · 06 ]

The numbers. The specs.

elrobot · assembled by makermods spec_sheet.txt

configurationleader + follower pair · teleoperation

degrees of freedom7 + 1

reach430 mm16.9"

weight~800 g per arm1.8 lb

servos16 × Feetech STS3215 serial-bus (8 per arm)

follower8 × STS3215 · 12 V · 30 kg·cm

leader8 × STS3215 · 7.4 V · back-drivable

control2 × serial-bus servo driver · data over USB A-to-C

powerfollower 12 V / 4 A · leader 7.5 V / 5 A · no battery

cameras2 × USB (arm-mounted + table-mounted) · included

structurefully 3D-printed (PLA)

build filesSTL · STEP · URDF · Bambu / Orca 3MF profiles

designNormaCore open hardware · assembled by MakerMods

hostbring your own laptop

[ FAQ · 07 ]

Things people ask before buying.

Fully assembled, wired, calibrated, and tested, both arms. A separate DIY kit (bagged parts, you print the structure) is coming later; email isaac@makermods.ai to register interest.

Two arms. You move the back-drivable leader by hand, and the follower mirrors it in real time. That's how demonstrations are recorded for imitation-learning research, and every $399 pre-order includes one leader and one follower.

The first batch ships by August 22, 2026, with delivery about a week after dispatch via express (customs times vary by country). We email you at each production step, and if we miss the ship-by date you get a full refund.

16 × Feetech STS3215 serial-bus servos across the pair, 8 per arm. The follower runs the 12 V / 30 kg·cm variant; the leader runs the 7.4 V variant so it stays back-drivable for smooth teleop. All standard, off-the-shelf, swappable parts.

You bring a laptop for teleoperation and recording, the arms connect over USB. Two USB cameras are included: one arm-mounted and one for the table view. Both power supplies are included too; there's no battery.

Yes, ElRobot is NormaCore's open hardware design. STL, STEP, URDF, and Bambu/Orca print profiles are public on the NormaCore GitHub repo, so you can print spares, repair any part, or mod the arm freely.

Pre-orders ship worldwide from Shenzhen, including China. Shipping, customs, and tax are added at checkout based on your address.