Product Link: https://store.dremc.com.au/products/nozzle-adxl345-accelerometer

How to Read Input Shaper Graph: https://support.dremc.com.au/en/support/solutions/articles/51000372996-how-to-read-input-shaper-graphs

TABLE OF CONTENTS

• Quick Start Guide
• How to Update Module (V1 PCB)
• How to Update Module (V1.3 PCB)

Quick Start Guide

How to install this Nozzle ADXL345

1. heat your hotend nozzle temperature up to 250ºc. unload filament. remove the nozzle.
2. let the printer cool down completely and turn off the printer.
3. place the nozzle through the PCB and attach it to the extruder. leave the silicione sock. connect the usb cable from the PCB to the raspberry. turn on the printer.
4. make all the readings and tunnings necessary but never heat up the hotend!
5. once done remove the PCB and the nozzle. reattach the nozzle only to the hotend. heat up the hotend at 120ºc and tight the nozzle a little but further. start printing!

How to Configure Klipper

[mcu ampon] serial: /dev/serial/by-id/usb-Anchor_Ampon-if00 
[adxl345] cs_pin: ampon:CS 
[resonance_tester] accel_chip: adxl345 probe_points: 90, 90, 20

How to auto tune the input shaper?

First, read this https://www.klipper3d.org/Resonance_Compensation.html don’t forget to tune pressure advance and all the other parameters. Input shaper should be the very last fine tunning proccess.

install the necessary dependencies via ssh:

~/klippy-env/bin/pip install -v numpy sudo apt update sudo apt install python3-numpy python3-matplotlib

back to the mainsail, edit printer.cfg and make sure you included the previous topic klipper configuration

test the connection between adxl345 and rapsberry. in mainsail terminal console run/send this code:

ACCELEROMETER_QUERY

you should receive something similar to this format:

Recv: // adxl345 values (x, y, z): 470.719200, 941.438400, 9728.196800

if not. please re-check your wiring or klipper config. something is wrong.

edit once again printer.cfg but now, this time, edit the printer section

[printer] kinematics: corexy max_accel: 10000 max_accel_to_decel: 10000 square_corner_velocity: 5.0 
[input_shaper]

now…. let’s run the auto tune.

in mainsail terminal run this code:

SET_VELOCITY_LIMIT ACCEL_TO_DECEL=10000 SET_PRESSURE_ADVANCE ADVANCE=0 SET_INPUT_SHAPER SHAPER_FREQ_X=0 SHAPER_FREQ_Y=0

If you HOME the printer the nozzle adxl will colide with the bed. Becareful! Fake the homing of the z axis by touching the TAP or the z sexbolt.

SHAPER_CALIBRATE

when it’s done run this code

SAVE_CONFIG

Edit printer section and revert max accel and decel to 4000.

restart and it should be it ?

How to Update Module (V1 PCB)

Using klipper firmware make configuration, within your raspberry pi terminals with klipper already installed.

More information: https://www.klipper3d.org/Installation.html

cd ~/klipper/
make menuconfig

Select the below configuration: