Marlin has run 3D printers for a decade. It’s on your Ender 3, your Prusa, your CR-10 — it’s the default. Klipper is the insurgent: it offloads motion planning to a Raspberry Pi and treats your printer’s mainboard as a dumb motor driver. The result is faster prints, better quality at speed, and a web interface that makes SD card shuffling obsolete.
But Klipper isn’t a drop-in upgrade. It’s a migration. You’ll reconfigure everything from scratch — there’s no Marlin-to-Klipper config converter that works reliably. Here’s what you gain, what you lose, and whether it’s worth the weekend of setup.
The Architecture Difference (and Why It Matters)
Marlin runs entirely on your printer’s mainboard. An 8-bit ATmega2560 or 32-bit STM32 handles G-code parsing, motion planning, temperature control, and stepper timing — all on one chip. This works fine at 60mm/s with modest acceleration. It falls apart above 100mm/s with high acceleration because the processor can’t compute motion trajectories fast enough to keep the stepper queue full. The result: micro-stutters, “salmon skin” surface artifacts, and hard speed ceilings.
Klipper splits the workload. A Raspberry Pi (or any Linux computer) does the heavy math — kinematic calculations, input shaping, pressure advance — and sends pre-computed step timings to the mainboard over USB. The mainboard just executes steps on schedule. A Raspberry Pi 3 has roughly 100× the processing power of an STM32F103. That headroom means Klipper can compute complex motion trajectories at 300mm/s with 10,000mm/s² acceleration and never starve the stepper queue.
The practical result: on the same printer hardware, Klipper typically enables 50-100% faster print speeds for the same quality, or dramatically better surface quality at the same speed.
Feature Comparison at a Glance
| Feature | Marlin 2.1.x | Klipper | What It Means in Practice |
|---|---|---|---|
| Motion planning CPU | Printer mainboard (STM32/ATmega) | Raspberry Pi + mainboard | Klipper handles complex kinematics without stuttering |
| Input shaping | Experimental (Marlin 2.1+) | Mature, built-in, tuned via ADXL345 | Klipper eliminates ringing at high speeds reliably |
| Pressure advance | Linear Advance (M593) | Pressure Advance (tuned per filament) | Klipper’s version is smoother; Marlin’s can cause extruder clicking |
| Web interface | OctoPrint (separate install) | Mainsail/Fluidd (built-in) | Klipper’s UI is native; Marlin requires bolt-on |
| Configuration | Compiled firmware (reflash to change) | Text file (edit and restart) | Klipper: change a setting, click restart. Marlin: recompile, reflash |
| Macro system | Limited G-code scripts | Full Jinja2 templating with variables | Klipper macros can do conditional logic, loops, sensor checks |
| Bed mesh | UBL/Bilinear (manual or probe) | Adaptive mesh (probes only print area) | Klipper’s adaptive mesh is faster and more targeted |
| Multi-MCU support | No | Yes (toolhead board + mainboard) | Klipper supports CAN bus toolhead boards for cleaner wiring |
| S-curve acceleration | Yes | Yes (with smoothing) | Both smooth direction changes; Klipper’s is more tunable |
| Filament runout handling | Basic pause | Full macros with custom actions | Klipper can park, notify, wait for reload — not just pause |
| Display support | Native LCD (12864, TFT) | KlipperScreen (touch UI) or stock LCD | Marlin’s display integration is more polished for stock screens |
| Community presets | Huge (every printer has a config) | Growing (Voron, Ender 3 common) | Marlin still wins for “download and flash” simplicity |
| Setup difficulty | Medium (compile firmware) | Medium-hard (install Linux, write config) | Klipper’s initial setup is harder; ongoing changes are easier |
The Klipper Migration: What You’re Signing Up For
Migrating from Marlin to Klipper involves three phases:
Phase 1: Hardware setup (1-2 hours). You need a Raspberry Pi (3B+ or better, or an old laptop running Linux) connected to your printer’s mainboard via USB. Install Klipper, Moonraker (API layer), and Mainsail or Fluidd (web UI) using KIAUH — the Klipper Installation and Update Helper script. Flash the Klipper firmware to your mainboard (this replaces Marlin). Your mainboard is now a “Klipper MCU.”
Phase 2: Configuration writing (2-4 hours for first timer). This is the real work. You’ll write a printer.cfg file from scratch that defines every pin, every motor, every thermistor, every endstop. There’s a reference config for most common printers (Ender 3, CR-10, Voron, etc.) but you’ll need to verify and adjust. The Klipper documentation is good — read it. Pay special attention to:
– [stepper_x], [stepper_y], [stepper_z] sections with correct pin assignments
– rotation_distance (Klipper’s equivalent of e-steps, calculated differently)
– [heater_bed] and [extruder] with correct thermistor types
– [bed_mesh] probe configuration if you have ABL
Phase 3: Tuning (ongoing). Run PID autotune for hotend and bed. Calibrate rotation_distance (extruder). Run input shaper calibration with an ADXL345 accelerometer (30 minutes, eliminates ringing permanently). Tune pressure advance per filament. Configure your START_PRINT and END_PRINT macros. This phase never truly ends — Klipper’s tunability is addictive.
What Makers Get Wrong About the Marlin-to-Klipper Switch
Mistake #1: Expecting Klipper to magically fix a poorly-built printer. Klipper’s input shaping compensates for resonance in a mechanically sound printer. It cannot fix a wobbly gantry, loose belts, or a Z-axis with 2mm of backlash. If your printer has mechanical problems, Klipper will print the same bad parts, just faster. Square your frame, tension your belts, and verify mechanical alignment before the firmware switch. Our belt tensioning guide covers the pre-migration mechanical checklist.
Mistake #2: Copying Marlin acceleration/jerk values directly into Klipper. The two firmwares calculate motion differently. Marlin’s jerk (mm/s) is not Klipper’s square corner velocity (mm/s) — the units look the same but the implementation differs. Klipper’s input shaping means you can typically run 2-3× higher acceleration without ringing. Start with conservative values (3000mm/s² acceleration, 5mm/s square corner velocity) and work up.
Mistake #3: Skipping the ADXL345 for input shaping calibration. You can tune input shaping manually by printing a ringing tower and measuring with calipers. It works. It also takes 2 hours and produces a result within maybe 15% of optimal. An ADXL345 accelerometer costs $5, attaches to the print head with a single screw, and produces a perfect frequency response graph in 3 minutes via Klipper’s TEST_RESONANCES command. For $5 and 10 minutes of setup, you get perfect input shaping. Skip the manual method.
Mistake #4: Not leveraging Klipper macros properly. The power of Klipper isn’t just speed — it’s automation. A well-written START_PRINT macro heats the bed first (saving time), homes while the hotend is still cold (preventing ooze), heats the hotend only after homing, probes a bed mesh only in the print area (adaptive mesh), and prints a purge line. It saves 2-3 minutes per print start and eliminates manual steps. Write good macros once; they pay back every print. As we covered in our G-code customization guide, smart start scripts transform workflow efficiency.
⚠️ Safety Notice: Firmware modification involves reconfiguring safety-critical systems including thermal runaway protection and endstop behavior. Always verify that thermal runaway protection is enabled and functional after any firmware migration. Test with hotend and bed at temperature — intentionally unplug the thermistor and verify the firmware halts heating within 30 seconds. A firmware migration without thermal safety verification is a fire hazard.
Teaching Tech’s Klipper setup guide covers the complete migration from a stock Ender 3:
Ready to make the switch? The BTT Manta M5P + CB1 bundle at uavmodel.com combines a 32-bit mainboard with an integrated Raspberry Pi CM4-compatible compute module — one board, no USB cable between Pi and MCU, cleaner wiring, and native Klipper support out of the box.