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BotBrain Hardware Assembly Manual

3D printable enclosures and robot interface parts for BotBrain. This guide covers printing, bill of materials, and step-by-step assembly instructions.

BotBrain Assembly

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Table of Contents

Overview

The BotBrain hardware consists of two main components:

  1. BotBrain - The main enclosure housing all electronics
  2. Robot Interface - A mounting adapter specific to your robot platform

You will need to assemble the BotBrain first, then attach it to the appropriate robot interface for your platform.

Directory Structure

hardware/
├── BotBrain/          # Core enclosure files
├── G1/                # Unitree G1 interface
├── Go2/               # Unitree Go2 interface
└── Tita/              # Direct Drive Tita interface

File Formats

Format Use Case
.3mf Recommended for most slicers (PrusaSlicer, Bambu Studio, Cura)
.stl Universal format, works with any slicer
.step CAD format for modifications

General Requirements

Tools Required

Tool Purpose
3D Printer Printing enclosure and interface parts
Screwdriver set (Phillips/Hex) Fastening components
Wire strippers Cable preparation
Tweezers Handling small components

Safety Precautions

Warning: Always disconnect power before assembly or disassembly.

  • Handle electronics carefully to avoid static discharge (use ESD strap if available)
  • Ensure proper ventilation when soldering
  • Wear safety glasses when removing supports from prints
  • Double-check polarity before connecting power

Print Settings

Use these settings for all BotBrain hardware parts:

Setting Recommended Value Notes
Material PLA PETG also acceptable for higher temp environments
Layer Height 0.2 mm Use 0.1 mm for finer detail
Infill 20-30% Higher infill for structural parts
Supports Tree supports -
Bed Adhesion Brim (optional) Helps prevent warping

BotBrain Assembly

The BotBrain Core is the main enclosure that houses all the electronics. Complete this assembly before attaching any robot interface.

Complete Assembly Video - Full step-by-step video walkthrough of the BotBrain assembly process

Bill of Materials - BotBrain

3D Printed Parts

Part Quantity File Notes
Top Case 1 BotBrain/top_case.stl Main cover
Bottom Case 1 BotBrain/bottom_case.stl Component housing

Electronics

Component Quantity Notes
Jetson Orin Nano 1 Without Base
USB-A/USB-C Cable 2 15cm length for better fit
RealSense Camera 2 D435i
12V DC-DC Converter 1 For D435i cameras
WAGO Connector 2 2-way
Barrel Jack Pigtail 1 -

Fasteners & Hardware

Item Quantity Notes
M3x10 Thread Forming 4 Preferably Hex/Allen
M3 Flat Washer 4 -

Assembly Steps - BotBrain Core

Step 1: Print the Enclosure Parts

Print both the top and bottom cases using the print settings above.

Step 2: Prepare the Bottom Case

Remove all support material and clean up any rough edges.

Tasks:

  1. Remove all support material with flush cutters
  2. Sand any rough edges or bumps
  3. Verify all mounting points are clear

Step 3: Install Electronics

Tasks:

  1. Place the screws in the mounting bosses on the bottom case
  2. Connect the WAGO connectors to both the input and output terminals of the 12V DC-DC converter
  3. Mount the 12V converter in the designated location on the bottom case
  4. Connect the barrel jack pigtail to the DC converter output WAGO connector
  5. Place the RealSense cameras in their mounting positions with USB cables pre-connected
  6. Place the Jetson Orin Nano in the correct position, routing the WiFi/Bluetooth antennas into the side pocket
  7. Connect the USB cables from the RealSense cameras to the Jetson Orin Nano
  8. Connect the power cable (barrel jack) to the Jetson Orin Nano power input

Step 4: Close the Enclosure

Attach the top case to complete the BotBrain assembly.

Tasks:

  1. Align the top case with the bottom case
  2. Gently press down until the snaps engage

Opening the case: To reopen, gently flex the sides of the bottom section to release the mounting snaps.

Robot Interface Assemblies

Choose the interface assembly guide for your specific robot platform.

Unitree G1 Interface

Mounting interface for the Unitree G1 humanoid robot.

Bill of Materials - G1 Interface

3D Printed Parts
Part Quantity File
G1 Interface Mount 1 G1/g1_interface.stl
Fasteners & Hardware
Item Quantity Size/Type Notes
M6x30 4 Preferably Hex/Allen
M6 Spring Lock Washer 4 -
Additional Components
Item Quantity Notes
Ethernet Cable 1 -
XT-30 Pigtail 1 -

Assembly Steps - G1 Interface

Note: Easier to assemble with the robot laying down, with its back upwards

Step 1: Print the Interface

Print the G1 interface mount using the print settings.

Step 2: Prepare the Interface

Tasks:

  1. Remove all support material
  2. Sand any rough edges or bumps
  3. Verify all mounting points are clear
Step 3: Mount to Robot

Tasks:

  1. Tighten BotBrain to the inteface with 4 thread forming M3 screws g1_mount_01

  2. Remove the sticker protection of the back mounting holes

  3. Connect the ethernet and power cables to the robot

  4. Pass the cables through the panel opening g1_mount_04

  5. Place the interface on the robot's back, aligning the screw holes

  6. Tighten the inteface on the robot using M6x30 screws g1_mount_06

Step 4: Attach BotBrain

Tasks:

  1. Connect the power and ethernet cables to the BotBrain
  2. Position the BotBrain using the alignment pins and tighten the screws

Unitree Go2 Interface

Mounting interface for the Unitree Go2 quadruped robot.

Bill of Materials - Go2 Interface

3D Printed Parts
Part Quantity File Notes
Go2 Interface Mount 1 Go2/go2_interface.stl Main mounting bracket
Fasteners & Hardware
Item Quantity Notes
M3x30 2 Preferably Hex/Allen
M3x20 2 Preferably Hex/Allen
M3 Spring Lock Washer 4 -
Additional Components
Item Quantity Notes
Ethernet Cable 1 -
XT-30 Pigtail 1 -

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Assembly Steps - Go2 Interface

Step 1: Print the Interface

Print the Go2 interface mount using the print settings.

The interface for the Unitree Go2 can also be found on Makerworld

Step 2: Prepare the Interface

Tasks:

  1. Remove all support material
  2. Sand any rough edges or bumps
  3. Verify all mounting points are clear
Step 3: Mount to Robot

Tasks:

  1. Unscrew the top lid screws go2_mount_01

  2. Connect the ethernet and power cables to the robot go2_mount_02

  3. Pass the cables through the interface opening go2_mount_03

  4. Place the interface on the robot back and tighten the M3x30 bolts on the front flange and the M3x20 bolt on the rear flange go2_mount_04

  5. Tighten the BotBrain to the inteface with 4 thread forming M3 screws go2_mount_05

Step 4: Attach BotBrain

Tasks:

  1. Connect the power and ethernet cables to the BotBrain
  2. Position the BotBrain using the alignment pins and tighten the screws

Tita Interface

Mounting interface for the Legged Robotics Tita robot.

Bill of Materials - Tita Interface

3D Printed Parts
Part Quantity File Notes
Tita Interface Mount 1 Tita/tita_interface2.stl Main mounting bracket
Fasteners & Hardware
Item Quantity Notes
M4x35 1 Preferably Hex/Allen
M4 flat washer 1 -
Additional Components
Item Quantity Notes
DB25 to Ethernet/Power Cable 1 Custom made

Note: The power and communication cable for the Tita robot uses a DB25 connector on Tita's side. This cable can be made/soldered using this Tita electrical schematic as reference.

Assembly Steps - Tita Interface

Step 1: Print the Interface

Print the Tita interface mount using the print settings.

Step 2: Prepare the Interface

Tasks:

  1. Remove all support material
  2. Sand any rough edges
Step 3: Mount to Robot

Tasks:

  1. Slide the interface onto Tita's rails until the interface screw hole is aligned with Tita's mounting point tita_mount_01

  2. Pass the cable with the power and ethernet connectors through the front opening of the interface tita_mount_02

  3. Connect the Ethernet cable to the Botbrain and tighten 4 thread forming M3x10 screws to ensure the component's stability tita_mount_03

Step 4: Attach BotBrain

Tasks:

  1. Connect the power and ethernet cables to the BotBrain
  2. Position the BotBrain using the alignment pins and secure all of the screws