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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteBack up more than one settings file before a 3D-printer firmware update. Save the printer’s configuration files and macros, export or record current runtime values, preserve persistent variables and calibration data stored separately, and keep the firmware build configuration when it is available. Whether EEPROM survives depends on the firmware family, printer model, board, version, and update method, so treat an update as a migration rather than assuming every value will remain unchanged.
What to back up before you flash new firmware
A reliable backup has several layers because no single export represents everything a printer uses. Firmware can contain build-time defaults, persistent storage, host-side files, startup scripts, macros, and calibration results. Updating one layer does not necessarily preserve the others.
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- Configuration source: Save the firmware configuration files used to build or customize the current installation. For a vendor-supplied printer, retain the configuration package or files supplied for that exact model and board.
- Runtime settings: Export or record values currently active in the printer. These can differ from the values in source files or nonvolatile memory.
- Persistent data: Copy saved variables, calibration tables, meshes, offsets, and other data stored outside the main configuration.
- Behavior files: Preserve startup and shutdown sequences, custom macros, included files, and any scripts that control routines such as probing or filament changes.
- Recovery copy: Keep a second copy on a separate computer or storage device, not only on the printer’s SD card, USB drive, or host filesystem.
Use the exact printer model, controller board, firmware version, and vendor update procedure as your reference. Manufacturers often customize commands, file locations, and upgrade steps.
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A report captures values the firmware can print at runtime; it does not recreate the source configuration used to compile the firmware. Conversely, source files may omit changes made after installation, such as altered steps, PID values, probe offsets, or leveling data. Keep both whenever possible.
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Do not assume that an EEPROM or other nonvolatile store is copied, converted, or even used by the new build. A firmware update may change parameter names, defaults, units, storage formats, or required safety settings. A successful flash only proves that code was written; it does not prove that every old setting was retained or remains valid.
Marlin: save the report, build configuration, and embedded export
Record active settings with M503
On Marlin installations that support it, send M503 through the printer’s host terminal or control interface and save the complete response as a text file. The command reports active runtime-configurable settings. Marlin warns that the report can differ from values stored in EEPROM, so treat it as an inventory of what the machine is using now, not as an EEPROM image.
M503Label the file with the printer model, board, firmware version, and date. Include the entire response rather than copying only a few lines; relationships between motion, temperature, probe, and leveling settings can matter during recovery.
Preserve the files used to build the firmware
Keep the complete Marlin configuration set, including the primary configuration files and any board- or vendor-specific files. Marlin configuration migration is version-sensitive: options can be renamed, removed, moved, or given different defaults. A clean copy of the old files lets you compare each setting with the new release instead of trying to reconstruct the machine from memory.
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Use the embedded configuration export when the build provides it
Some Marlin builds expose a configuration-embedding option that can write a ZIP containing configuration information to an SD card or flash drive. If that option appears in the printer’s menu or is documented for the build, create the export before flashing and copy it to another device. The removable media is an export destination, not an automatic backup of EEPROM, and it should not be your only copy.
Klipper: back up the host configuration and saved variables
Copy the complete configuration tree
Klipper’s printer definition normally lives on the host computer rather than in the microcontroller’s flash. Copy the main printer configuration file and every file it includes. That includes custom macros, startup and shutdown sequences, probe definitions, resonant or input-shaper settings, and any other files referenced by include statements.
Preserve the exact directory structure and filenames. An include that worked before the update can fail if a file is renamed or omitted, even when the main file itself is present.
Protect files changed by SAVE_CONFIG
Klipper’s SAVE_CONFIG command writes generated values back into the main printer configuration file. Because it overwrites that file, copy it after the last calibration and before updating. If you keep a manually edited version elsewhere, save both the generated file and your edited source so you can identify which values came from calibration.
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SAVE_CONFIGBack up save_variables data
If the configuration uses Klipper’s save_variables feature, copy the variables file as well. Persistent variables may include user preferences, counters, or values used by macros and are separate from the ordinary printer configuration. A configuration backup without this file can leave macros running with missing or reset state.
Plan for migration changes
Klipper upgrades can require configuration changes. Read the release notes and migration guidance for the specific version, compare the old files with the new reference, and change only options confirmed to be compatible. Do not blindly paste an old file over a newly generated one; preserve the new version’s required structure and re-enter values deliberately.
RepRapFirmware: preserve config.g and startup files
Copy the files read at startup
RepRapFirmware reads /sys/config.g from the SD card during startup. Save that file and related system files, including macros and other startup scripts used by the printer. These files define the machine’s behavior before a print begins, so a runtime report alone is not an adequate substitute.
Validate before restoring
A malformed config.g can prevent normal startup or leave the board unable to complete initialization. Compare the old file with the syntax and commands supported by the target firmware version before copying it back. Keep a known-good file available so you can remove a bad change from the SD card if the board fails to boot.
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Do not generalize M500 and M501
RepRapFirmware command behavior and persistence differ by version and implementation. The presence of M500 or M501 in a command reference does not guarantee that a particular vendor build stores or restores every setting in the same way. Follow the board’s update instructions and verify where the current installation keeps persistent data.
Settings and data worth checking individually
After you have copied the files and reports, make a human-readable checklist of values that can make a printer unsafe or inaccurate if they are lost. Not every firmware stores these categories in the same location, but each is worth verifying when relevant:
- Motion: steps per millimeter or rotation distance, maximum feed rates, acceleration, jerk or equivalent motion limits, and axis directions.
- Drive configuration: motor current, driver mode, microstepping assumptions, and any sensorless-homing thresholds.
- Temperature control: thermistor type, heater assignments, temperature limits, PID values, and fan behavior.
- Homing and safety: endstop logic, probe type, probe offsets, homing order, safe homing coordinates, and thermal-protection settings.
- Leveling: bed mesh or other leveling data, fade or compensation settings, and the procedure used to regenerate the mesh.
- Extrusion: extruder steps or rotation distance, direction, maximum extrusion limits, retraction values, and pressure-advance or linear-advance settings.
- Macros and workflows: start and end G-code, purge routines, filament-change sequences, pause and resume commands, and custom buttons.
- Network and host details: host connection settings or access details when the update affects the host-side controller rather than only the printer board.
Record units and the conditions under which a value was measured. For example, note whether a PID tune used a particular nozzle, fan speed, or material; otherwise a technically correct number may be inappropriate after hardware changes.
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Firmware comparison at a glance
| Firmware | What to preserve | What is established | Main risk during an update |
|---|---|---|---|
| Marlin | M503 text report, build configuration, and any embedded configuration ZIP |
M503 reports active runtime settings and may differ from EEPROM. Some builds can export embedded configuration to SD or flash storage. |
Confusing runtime values with EEPROM or build-time configuration, then restoring incompatible options. |
| Klipper | Host-side printer configuration, included files, macros, and the saved-variable file when used | SAVE_CONFIG overwrites the main configuration file; saved variables are maintained separately; upgrades can require setting changes. |
Missing an included file or persistent-variable file, or replacing a migrated configuration with an obsolete copy. |
| RepRapFirmware | /sys/config.g, related system files, macros, and relevant SD-card contents |
config.g is read at startup; malformed content can interfere with startup. Persistence commands are firmware-dependent. |
Restoring syntax or commands that the target version does not accept. |
The important comparison axes are storage location, runtime versus persisted state, coverage of configuration files, and the vendor’s migration procedure. Two printers using the same firmware family can still differ because of board, version, or manufacturer customizations.
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A safe backup-and-update procedure
- Identify the installation. Write down the printer model, controller board, current firmware family and version, host software version where applicable, and the exact update package or vendor path you intend to use.
- Make a working folder. Use a descriptive name containing the model and date. Put configuration files, reports, macros, calibration exports, and release notes in it.
- Export runtime values. Run
M503on supported Marlin systems and save the full response. For other firmware, use its documented report or status commands and save the output. - Copy configuration sources. Include vendor files, custom edits, included files, startup scripts, and macros. For Klipper, preserve the host directory structure; for RepRapFirmware, include the system files used at startup.
- Copy persistent data. Save Klipper’s saved-variable file when present, leveling or mesh data, and any separate calibration or user-data files used by your installation.
- Create a second copy. Copy the folder to a computer or other independent storage. A removable card or flash drive can hold an export, but it should not be the only location.
- Read the target release notes. Check for renamed settings, required migrations, changed defaults, board-specific procedures, bootloader requirements, and warnings about preserving or clearing nonvolatile memory.
- Document hardware assumptions. Note nozzle and thermistor types, probe hardware, driver configuration, and any recent mechanical changes so you can distinguish firmware problems from hardware differences.
- Flash according to the vendor procedure. Use the specified file name, storage medium, power sequence, and recovery method. Do not interrupt power while the board is writing firmware.
- Boot without printing. Confirm that the printer starts, connects to its host, reports temperatures plausibly, and accepts commands before restoring production settings.
- Compare before restoring. Diff the new configuration against your saved files. Apply only settings supported by the new version and preserve new safety defaults unless the vendor explicitly instructs otherwise.
- Recalibrate where needed. Recheck motion, extrusion, temperature control, probe offsets, and leveling rather than assuming old calibration remains valid.
Post-update verification and recovery
Run safety checks first
- Verify temperature sensors show credible room-temperature readings before enabling heaters.
- Test heater and fan assignment cautiously and confirm that thermal protection remains enabled.
- Home each axis while ready to stop motion, then check endstop and probe behavior.
- Confirm configured travel limits, motor directions, and maximum speeds before commanding long moves.
- Check that the extruder direction, steps or rotation distance, and maximum extrusion limits are correct.
Restore in small groups
Apply motion settings first, then temperature and extrusion values, followed by probe and leveling data and finally convenience macros. Restart or save exactly as the firmware documents after each group. This isolates the setting that causes a startup error or unexpected motion.
If the printer will not start
Remove the newest configuration change and return to the known-good copy. On RepRapFirmware, inspect config.g and related startup files for unsupported syntax. On Klipper, check the host log for a missing include or invalid option and restore the saved configuration tree. On Marlin, use the vendor’s bootloader or recovery method and keep the old configuration files available for a compatible rebuild.
If prints are inaccurate but the machine boots
Check steps or rotation distance, acceleration and speed limits, PID behavior, probe offsets, and leveling data before changing slicer settings. A firmware migration can leave a printer operational while one of these values has reverted to a default or changed units.
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Common backup mistakes
- Saving only a screenshot: An image is difficult to restore and omits files, macros, and persistent variables.
- Saving only EEPROM values: Nonvolatile storage may not be migrated, and it does not contain host-side or build-time configuration.
- Saving only source files: Runtime tuning performed after compilation may be absent.
- Overwriting the old copy: Keep the pre-update folder unchanged so you can compare and recover.
- Restoring everything blindly: Version changes can make an old option invalid or unsafe.
- Skipping a second location: A failed SD card, host disk, or accidental reformat can remove the only backup.
- Testing with a real print first: Verify motion, heaters, probing, and limits without loading a long job.
Bottom line
Back up the configuration source, a current runtime report, persistent variables and calibration data, and every macro or included file your printer depends on. Marlin users should save M503, configuration files, and any embedded export; Klipper users should copy the host configuration tree and saved variables; RepRapFirmware users should preserve /sys/config.g and related startup files. Then follow the exact model-specific migration procedure and validate safety-critical behavior before printing.
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