Marlin vs Klipper: Key Differences and When to Use Each

In 3D printing, Marlin is a traditional all-in-one firmware running directly on the printer's controller, while Klipper offloads complex calculations to a separate computer, improving speed and precision. Marlin is simpler to set up, but Klipper offers better performance and advanced features through its unique architecture.

Quick Comparison

This table summarizes the main differences between Marlin and Klipper firmware for 3D printers.

Factor	Marlin	Klipper
Architecture	Runs entirely on printer's microcontroller	Uses microcontroller + external computer (e.g., Raspberry Pi)
Performance	Good but limited by microcontroller speed	Higher speed and smoother motion with offloaded processing
Setup Complexity	Easier, single device setup	More complex, requires network and host computer
Features	Standard features, widely supported	Advanced features like pressure advance and input shaping
Hardware Requirements	Only printer controller needed	Needs additional computer for host processing
Community Support	Large, mature community	Growing, enthusiastic community

Key Differences

Marlin firmware runs fully on the 3D printer's microcontroller, handling all tasks like motion control, temperature regulation, and sensor reading. This makes it straightforward to install and use on most printers without extra hardware. However, its performance depends on the microcontroller's processing power, which can limit print speed and smoothness.

Klipper takes a different approach by splitting tasks: the microcontroller handles low-level commands, while a connected computer (like a Raspberry Pi) performs complex calculations and motion planning. This allows Klipper to achieve faster, more precise printing with features like pressure advance and input shaping that reduce artifacts. The trade-off is a more complex setup requiring network configuration and a separate host device.

In terms of features, Klipper often leads with advanced motion algorithms and easier firmware updates via the host computer. Marlin remains popular for its simplicity, broad hardware compatibility, and large user base, making it ideal for beginners or those with limited hardware.

Code Comparison

Here is an example of how a simple temperature PID setup looks in Marlin firmware configuration.

c++

#define DEFAULT_Kp 22.2
#define DEFAULT_Ki 1.08
#define DEFAULT_Kd 114

void setup() {
  // PID parameters for hotend temperature control
  pid.SetTunings(DEFAULT_Kp, DEFAULT_Ki, DEFAULT_Kd);
}

void loop() {
  // Regular temperature control loop
  pid.Compute();
  heater.SetPower(pid.Output);
}

Output

Controls hotend temperature using PID with defined constants

Klipper Equivalent

The equivalent temperature PID setup in Klipper is done in a configuration file, showing its declarative style.

ini

[heater_hotend]
pid_Kp=22.2
pid_Ki=1.08
pid_Kd=114

[heater_fan]
pin: P2.4

Output

Configures hotend PID parameters and heater fan pin

When to Use Which

Choose Marlin if you want a simple, all-in-one firmware that runs directly on your printer without extra hardware. It is ideal for beginners or printers with limited electronics. Marlin's large community and compatibility make it a reliable choice for standard 3D printing needs.

Choose Klipper if you want higher print speeds, smoother motion, and advanced features like pressure advance or input shaping. It is best when you have or can add a small computer like a Raspberry Pi to your setup and are comfortable with a more complex installation. Klipper excels in performance and customization for experienced users.

Key Takeaways

Marlin runs fully on the printer's controller, making it simpler to set up and use.

Klipper offloads calculations to an external computer, enabling faster and smoother printing.

Marlin is best for beginners or limited hardware setups.

Klipper suits advanced users seeking higher performance and features.

Both have strong communities but differ in complexity and hardware needs.