Klipper Firmware Guide — What It Is and How to Install It

Klipper has become the firmware of choice for anyone who wants faster, higher-quality prints from their existing 3D printer. Unlike traditional firmware that runs everything on the printer's limited microcontroller, Klipper offloads the heavy computation to a separate host computer — typically a Raspberry Pi — and this architectural change unlocks features that would be impossible on standard firmware.

This guide explains what Klipper is, why it matters, and walks through the full installation process step by step.

What Is Klipper and How Does It Work

Traditional 3D printer firmware like Marlin runs entirely on the printer's mainboard, which typically has an 8-bit or 32-bit microcontroller. These chips handle everything: parsing G-code, calculating motion paths, managing temperatures, and driving stepper motors. The limited processing power constrains what the firmware can do.

Klipper takes a different approach. It splits the workload between two devices:

1. Host computer (Raspberry Pi or similar): Runs the Klipper host software, which handles G-code parsing, motion planning, and all complex calculations.
2. Printer microcontroller (existing mainboard): Runs a lightweight Klipper MCU firmware that simply executes precisely timed stepper motor commands sent by the host.

This architecture means the computationally expensive parts run on a powerful ARM processor with gigabytes of RAM, while the microcontroller focuses solely on what it does best — precisely timed hardware control.

Why Switch to Klipper

Input Shaping

This is the headline feature. Input shaping compensates for mechanical vibrations (resonances) that cause ghosting and ringing artifacts on prints. According to the official Klipper documentation, input shaping applies a filter to cancel out the specific resonant frequencies of your printer's frame.

The practical result is that you can print significantly faster without the surface quality degradation that normally comes with high speeds. As documented by The Tech Influencer, properly configured input shaping can enable printing at twice the speed while eliminating ghosting artifacts.

To use input shaping, you need an accelerometer (ADXL345 is the most common) mounted to the printhead and bed. Klipper runs a calibration routine, measures the resonant frequencies, and automatically configures the shaper parameters.

Pressure Advance

Pressure advance compensates for the lag between extruder commands and actual filament flow. When the extruder starts pushing filament, there is a delay before plastic actually exits the nozzle due to pressure buildup in the melt zone. Similarly, when the extruder stops, residual pressure continues to push filament out.

Klipper's pressure advance algorithm predicts this behavior and adjusts extrusion commands accordingly. The result is sharper corners, cleaner starts and stops, and dramatically reduced stringing and blobbing.

Higher Step Rates

Klipper can achieve step rates exceeding 200,000 steps per second on 32-bit boards, compared to Marlin's typical ceiling of around 100,000. Higher step rates mean smoother motion at high speeds and the ability to use higher microstepping for quieter operation without sacrificing speed.

Multi-MCU Support

Klipper can coordinate multiple microcontrollers in a single printer. This is useful for printers with separate boards for the mainboard and toolhead, or for adding an extra board to control additional steppers or sensors. Each MCU is precisely synchronized by the host.

Configuration Without Recompiling

With Marlin, changing a setting requires editing source code and recompiling the firmware, which takes minutes and risks introducing errors. Klipper's configuration is a simple text file (printer.cfg) that you edit and reload in seconds. This makes tuning dramatically faster.

What You Need

Hardware

• Host computer: A Raspberry Pi 4 with at least 2 GB RAM is the standard recommendation. A Raspberry Pi 3B+ works but has less headroom. Some users run Klipper on old laptops, Orange Pi boards, or even repurposed Android phones.
• Your 3D printer: Klipper supports hundreds of mainboards. Creality boards (Ender 3, Ender 5, CR-10), BTT SKR boards, MKS boards, and most 32-bit boards are supported. Check the Klipper configuration reference for your specific board.
• MicroSD card: 16 GB or larger, Class 10 or better.
• USB cable: To connect the Raspberry Pi to the printer's mainboard.
• Optional: ADXL345 accelerometer for input shaping calibration.

Software

• Klipper: The firmware itself.
• Moonraker: An API server that acts as the communication layer between the web interface and Klipper.
• Web interface: Either Mainsail or Fluidd (discussed below).
• KIAUH: Klipper Installation And Update Helper — a script that automates the installation of all components.

Mainsail vs Fluidd: Choosing Your Web Interface

Both Mainsail and Fluidd are browser-based frontends that let you control your Klipper printer from any device on your network. According to a comparison by Kingroon, both connect to Klipper through Moonraker and offer similar core functionality, but they differ in philosophy.

Mainsail

Mainsail is the more feature-rich option. It includes a built-in configuration editor with syntax highlighting and error checking, a macro store with pre-built scripts for common tasks, detailed print history tracking, and system resource monitoring showing your Raspberry Pi's CPU, memory, and disk usage in real time.

Best for: Users who want extensive customization, detailed analytics, and a full-featured dashboard.

Fluidd

Fluidd is the lighter, faster option. It loads quickly even on resource-constrained devices like the Raspberry Pi Zero W. Its standout feature is the ability to hot-reload configuration files without restarting the Klipper service — you edit printer.cfg, save it, and the changes take effect immediately.

Best for: Users who prioritize speed, simplicity, and a clean interface.

The good news is that you do not have to choose permanently. Using KIAUH, you can install both on the same Raspberry Pi and switch between them. They run on different ports and coexist without issues.

Installation: Step by Step

This walkthrough uses KIAUH on a Raspberry Pi 4 with a Creality Ender 3 as the example printer. The process is similar for other printers — only the printer.cfg file differs.

Step 1: Flash the Raspberry Pi

Download Raspberry Pi Imager and flash Raspberry Pi OS Lite (64-bit) to your microSD card. In the imager's advanced settings, enable SSH, set a username and password, and configure your WiFi network. Insert the card into the Pi and power it on.

Step 2: SSH into the Pi

Connect to the Pi via SSH from your computer:

ssh your-username@your-pi-ip-address

Update the system:

sudo apt update && sudo apt upgrade -y

Step 3: Install KIAUH

Clone and run KIAUH:

cd ~ && git clone https://github.com/dw-0/kiauh.git
cd kiauh && ./kiauh.sh

KIAUH presents a menu-driven interface. Select option 1 (Install) and then install the following in order:

1. Klipper — the firmware itself
2. Moonraker — the API layer
3. Mainsail or Fluidd — your chosen web interface

Each installation takes a few minutes. KIAUH handles all dependencies automatically.

Step 4: Build and Flash the Printer Firmware

From the KIAUH menu, select the firmware building option, or manually run:

cd ~/klipper
make menuconfig

In the configuration menu, select your printer's microcontroller type. For a Creality Ender 3 V2 with the common STM32F103 board, as described in Creality's Klipper guide:

• Micro-controller Architecture: STMicroelectronics STM32
• Processor model: STM32F103
• Bootloader offset: 28KiB
• Communication interface: Serial (on USART1 PA10/PA9)

Build the firmware:

make clean && make

The compiled firmware file (klipper.bin) needs to be copied to a microSD card, renamed to something the bootloader expects (often firmware.bin), and inserted into the printer. Power cycle the printer to flash.

Step 5: Configure printer.cfg

This is where you tell Klipper about your specific printer's hardware. Klipper provides example configuration files for hundreds of printers. Find your model, copy the configuration, and paste it into the printer.cfg editor in your Mainsail or Fluidd interface.

Key sections to verify:

• [stepper_x], [stepper_y], [stepper_z]: Step distance, direction pins, endstop pins, and position limits.
• [extruder]: Nozzle size, filament diameter, PID values, pressure advance (start at 0 and tune later).
• [heater_bed]: PID values for the heated bed.
• [mcu]: The serial port path to your printer's mainboard (usually /dev/serial/by-id/...).

Step 6: First Connection

Save the printer.cfg file. Klipper will attempt to connect to the printer's MCU. If the serial path is correct and the firmware was flashed properly, the dashboard will show a connected state with temperature readings.

Run the following initial calibrations:

1. PID tuning for the hotend and bed (Klipper has built-in PID_CALIBRATE commands)
2. Probe calibration if using a bed probe
3. Bed mesh leveling
4. Extruder rotation distance calibration

Tuning Input Shaping

Once the printer is running, input shaping calibration is the single highest-impact optimization you can make.

Without an Accelerometer

Print a ringing test model at increasing speeds and visually identify the ringing frequency. This is less precise but works in a pinch. Klipper's documentation provides test models and measurement instructions.

With an ADXL345 Accelerometer

Wire the ADXL345 to the Raspberry Pi's SPI interface (or to the printer's toolhead board if it has an SPI port). Add the accelerometer configuration to printer.cfg, then run:

SHAPER_CALIBRATE

Klipper vibrates the printer at various frequencies, measures the response with the accelerometer, and recommends the optimal shaper type and frequency for each axis. Apply the recommended values to printer.cfg and you are done.

As Obico's guide details, the practical difference is dramatic — ringing artifacts that were visible at 60 mm/s with Marlin are eliminated even at 150 mm/s or higher with Klipper's input shaping.

Tuning Pressure Advance

Klipper includes a pressure advance tuning tower. Print it, measure the best-looking layer, and calculate the corresponding pressure advance value. Typical values range from 0.03 to 0.10 for direct-drive extruders and 0.30 to 1.00 for Bowden setups.

Finding Klipper Configuration Files and Macros

The Klipper community shares configuration files, macros, and tuning profiles across various platforms. Use 3DSearch to find printable calibration tools like ringing test towers, pressure advance test prints, and bed leveling models across Printables, Thingiverse, and MakerWorld in one search.

Is Klipper Worth It

If you own a budget or mid-range printer and want better print quality at higher speeds, Klipper is the single best upgrade you can make. It costs nothing except a Raspberry Pi (which many makers already own) and a few hours of setup time. The features it enables — input shaping, pressure advance, and faster step rates — are otherwise only available on premium printers from Bambu Lab or Prusa Research that cost several times more.

For Ender 3 owners in particular, Klipper transforms a $200 printer into a machine that competes with printers three times its price. The community support is excellent, and the configuration-file approach means you can share and replicate setups easily.

Final Thoughts

Klipper is not just firmware — it is a fundamentally different architecture for running a 3D printer. The split between a powerful host computer and a precisely timed microcontroller enables features that traditional firmware cannot match. Installation takes an afternoon, tuning takes a weekend, and the results last for as long as you own the printer.

Start with KIAUH for a painless installation, choose Mainsail or Fluidd based on your preference for features versus simplicity, and prioritize input shaping calibration as your first tuning step. Your prints — and your print speeds — will thank you.