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https://github.com/MotorDynamicsLab/Rethonance

Introduction

The Unicorn Chasing Kit is a resonance compensation toolkit centred around two core components: the Rethonance Nozzle, a V6-compatible nozzle with a built-in ADXL345 accelerometer and the Rethonance Hub, a magnetic, bed-mountable board that consolidates connectivity for ADXL sensors, motor thermistors, and a GPIOextension port all over a single USB connection. Together, they provide a convenient way for users to precisely measure resonance at where it actually matters – the nozzle.

Features

• V6 Compatibility, the Rethonance Nozzle is compatible with any hotend that accepts V6 hotends.
• USB Klipper connection, the Rethonance Hub connects to the Raspberry Pi via standard USB connection, making setup easy and quick.
• Dual ADXL ports, the Rethonance Nub allows for two ADXL boards to be connected simultaneously.
• 4X Thermistor ports, useful for monitoring motor temperature or chamber temperature.
• GPIO extension port, an extension port that allows users to expand the functionality of the Rethonance Hub.

System Overview

The Unicorn Chasing Kit consists of the Rethonance Nozzle and Hub along with related cables. A simplified wiring diagram is shown below:

• Rethonance Nozzle, This is the nozzle accelerometer that can be screwed on to the hotend.
• Rethonance Hub, This is a bed mountable board with an onboard STM32G0B1 microcontroller. The hub connects acts as an intermediary between the Rethonance Nozzle and Raspberry Pi. It features two accelerometer ports as well as four thermistor ports and an extension port.
• FFC Cable, this is a standard FFC flex cable that connects the Rethonance Nozzle to the Hub. The cable is lightweight so as to not affect resonance readings. It is also low cost and easily replaceable if needed.
• USB A to C Cable, this standard USB cable connects the Rethonance Hub to the Raspberry Pi.

Printed Parts

The Rethonance Hub is designed to be installed on a simple printed mount. The mount allows the hub to be easily placed and removed on the heatbed as needed. The mount includes three magnets that allow it to be latched to the flex plate when in operation. The printed parts are available in here https://github.com/MotorDynamicsLab/Rethonance/tree/master/STLs. The CAD file for the Hub is also available on github to allow anyone to design custom mounting solutions.

Klipper Config Files

A Klipper Configuation can be found in the Rethonance github repo here. Most ports in the configuration file are commented out, remember to enable any port that you want to use.