Klipper vs Marlin: Which Firmware Should You Run?

Most comparisons of Klipper and Marlin turn into a list of features, which hides the only difference that actually decides the answer. Marlin is a single program running on the printer’s own microcontroller. Klipper is two programs: a host process on a Linux computer that does the planning, and a thin firmware on the microcontroller that executes step timings the host already worked out.

Every other difference follows from that one, including the ones that will annoy you.

What the Split Actually Changes

Marlin has to parse G-code, run the planner, compute step timings, drive the display, and service interrupts, all inside whatever budget the printer’s chip has. That budget is the ceiling on how sophisticated the motion math can be. Klipper moves the expensive parts to a machine with orders of magnitude more compute, which is why features like a general iterative kinematics solver and per-axis resonance compensation are practical there.

The cost is a second computer that has to be powered, updated, and kept alive for the whole print. Klipper’s own feature documentation describes the host as the machine that decides when each stepper motor steps and transmits those events to the microcontroller, so the host is not an accessory and a print does not continue without it.

Side by Side

	Klipper	Marlin
Where motion is computed	Linux host, streamed to the MCU	On the printer’s MCU
Configuration format	printer.cfg, plain text on the host	Configuration.h / Configuration_adv.h, compiled in
Changing a setting	Edit text, restart firmware	Recompile and reflash, unless the setting has an M-code
Reflashing the board	Only on MCU change or a protocol-breaking upgrade	For every compile-time change
Input shaping	Multiple shaper types per axis, driven by a measured resonance profile	ZV input shaping in the 2.1 series, enabled at compile time, tuned at runtime with M593
Resonance measurement	Built in, using a supported accelerometer	Not built in; frequency comes from a ringing test print or an external tool
Extrusion pressure model	Pressure advance	Linear advance (M900)
Scripting	[gcode_macro] blocks with full template logic	Limited user G-code slots and menu items
User interface	Web front end, or an optional touchscreen	On-board LCD menu, standalone
Prints with no host attached	No	Yes, from SD or USB media
Extra hardware needed	Host SBC, power, storage	None
Exotic kinematics	Iterative solver covers delta, polar, and hybrid layouts	Supported per kinematic, hand-written

Configuration Workflow Is the Day-to-Day Difference

Marlin’s configuration lives in C headers that are compiled into the binary. Changing a stepper current default, a thermistor table, or a homing direction means editing source, building, and flashing. Marlin exposes a lot at runtime through M-codes and M500 EEPROM saves, which softens this considerably, but the shape of the machine is decided at compile time.

Klipper’s configuration is a text file on the host, applied with a firmware restart that takes seconds. That makes it diffable, backupable, and trivially reversible, which matters more than it sounds during a tuning session where you are changing one number at a time and want to know exactly what you changed. Keep printer.cfg in version control before you start; it is the cheapest insurance in the whole project.

The flip side is that Klipper gives you no menu-driven safety net. There is no LCD screen where a wrong value can be nudged back. A syntax error means Klipper refuses to start, and you fix it in a text editor.

Tuning Features Are Not Symmetric

Both firmwares now have an extrusion pressure model and both now have input shaping, so a feature checklist makes them look closer than they are. The asymmetry is in how you arrive at the numbers.

Marlin’s M593 lets you set an input shaping frequency and damping per axis at runtime, once the feature is compiled in. Finding the frequency is left to you, typically by printing a ringing test tower and measuring the spacing of the artefacts, or by using an accelerometer through some tool outside Marlin.

Klipper measures the machine directly. An accelerometer on the toolhead produces a resonance profile per axis, and the calibration script recommends both a shaper type and a frequency from that data, along with an acceleration ceiling implied by the smoothing each shaper costs. That is a different quality of answer than reading a number off a print, and it is the single strongest argument for the extra hardware. The procedure is set out in Klipper input shaper setup with an ADXL345; the relationship between measured frequency, shaper choice, and usable acceleration is what the input shaper and acceleration sizer exists to make visible.

Shaper choice is a trade, not a free win. More aggressive vibration suppression costs more smoothing, and smoothing costs effective acceleration and fine detail. Neither firmware removes that trade; Klipper just gives you the data to make it deliberately.

Reliability and Failure Surface

Marlin has fewer parts that can fail. The board boots, the print runs, and nothing depends on a network stack or a filesystem that gets written to continuously.

Klipper adds a host, and with it a set of failure modes that are not firmware problems at all: a worn microSD card, an undervolted 5V supply, a USB port that renumbers on boot, a web front end update that breaks an API contract. Most of these are solved once and stay solved, but they are real, and they are the reason a Klipper install is genuinely more work than flashing Marlin. The hardware choices that avoid the common ones are covered in Klipper hardware requirements.

There is a mitigating factor worth knowing: Klipper fails loudly rather than quietly. A configuration error stops the firmware from starting instead of leaving a bad value silently in effect, and a connection or communication problem surfaces as a named error in the console rather than as a print that slowly goes wrong.

Who Should Run Which

Run Marlin if the printer is a single-purpose appliance, the current speeds are acceptable, nobody wants to maintain a Linux machine, or the printer needs to run from its own screen with no other computer in the room. A well-configured Marlin machine is not a compromise; it is the correct answer for a large share of printers.

Run Klipper if you intend to push acceleration and want the resonance data to justify it, you want configuration you can diff and roll back, you run unusual kinematics, you want real scripting in your macros, or you already have a spare single board computer and the marginal cost is an afternoon.

Run neither if what you actually want is fast prints rather than a motion-control project. A closed-ecosystem CoreXY machine that ships already tuned removes the entire question: no printer.cfg, no accelerometer, no host to maintain. The Bambu Lab P1S is the common example of that trade, and it is a real trade rather than a lesser choice. What you give up is the thing this site is about: the firmware is the vendor’s, the tuning is the vendor’s, and the configuration surface is whatever they chose to expose.

Switching Costs

Going from Marlin to Klipper is not a one-evening job, and it is more honest to say so. You will rebuild the machine’s configuration from scratch in a new format, re-derive rotation distance and extruder calibration, and re-tune pressure advance, because none of those values transfer cleanly. Budget a weekend for a machine you know well and longer for one you do not.

Going back is easier, since the Marlin build you flashed away from still exists, but the printer will not be tuned to the same standard unless you kept those numbers.

The order that works is the same either way: mechanical soundness first, then extruder calibration, then pressure advance, then resonance measurement, then speed. The firmware you pick changes how comfortable each step is. It does not change the order, and it does not let you skip one. That sequence, and why working it backwards wastes so much time, is the subject of Klipper firmware architecture and input shaper tuning.