The Kobra X does not throw vague “something went wrong” pop-ups. When it hits a fault it shows a five-digit code (things like 10120 or 11518) next to a short description, and sometimes a QR code you can scan to jump straight to Anycubic’s wiki page for that exact fault. That code is the only thing worth writing down. “Z-axis homing failed” on its own could mean six different things; CODE:10120 points to one specific fault tree. If you only remember one thing from this guide, remember to read the number off the screen before you touch anything, because the fix for 10120 and the fix for 10130 (both technically “Z-axis” errors) are not the same repair.
This index is built from Anycubic’s official error code documentation at wiki.anycubic.com, cross-referenced against the pages that are specifically tagged for the Kobra X and Kobra X Combo. Anycubic’s own error code index page carries a note that the section is “under construction” and some codes on it are still missing detailed troubleshooting write-ups, so a handful of entries below are thinner than others simply because Anycubic hasn’t published more on them yet. Where that’s the case, it’s flagged.
One thing worth knowing up front: the Kobra X is not just a Kobra 2 or Kobra 3 with a different sticker. It uses Anycubic’s ACE GEN2 system, which is a multi-channel filament feed built into the machine and the printhead itself rather than a separate external box like the ACE Pro unit on the Kobra 3 series. That’s why several Kobra X-specific codes reference filament “channels” and a diverter mechanism inside the toolhead. Some fixes for those codes involve opening up the printhead itself, not swapping a plug on an external module. Keep that in mind if you’ve fixed a Kobra 3 before and expect the same layout, and see the Anycubic ACE Pro setup guide if you want the external-module version of this system for comparison.
Print task and file errors
These show up when the printer can’t start, resume, or read a job, and they’re usually the least mechanical of the bunch.
CODE:10111, Task abnormally ended. The print job stopped without a clean finish. Anycubic’s guidance is to check your slicer settings and restart the print. If it happens repeatedly on the same file, re-slice from scratch rather than reusing an old gcode file.
CODE:10115, The device cannot parse the file. The file is either damaged from an interrupted slice or the format is wrong. Anycubic’s fix here is specific: slice and save the file to your desktop first, then copy it to the USB drive, don’t save directly to the drive from the slicer, since pulling the drive mid-save is a common cause of corruption. The file name has to end in .gcode, avoid special characters, and keep it no more than two folders deep. The USB drive itself also matters: Anycubic specifies it should be under 128GB and formatted FAT32 with a 4096-byte allocation size.
CODE:10116, Abnormal slice file and CODE:10133, missing necessary commands. Both point back to slicer settings. Recheck your print profile, particularly anything customized from Anycubic’s default Kobra X profile, and re-slice.
CODE:10113, MD5 checksum verification failed. The file that landed on the printer doesn’t match what was sent from the cloud or app. Re-transfer the file; if it fails again, try a wired USB transfer instead of Wi-Fi.
Homing, motion, and leveling errors
CODE:10118, X-axis homing failed. First check on the touchscreen whether you can jog the X-axis manually. If the motor won’t move, Anycubic’s repair path goes through the printhead: pull the PTFE tube, remove the printhead’s rear cover and signal cable, then remove the printhead module itself to inspect the strain gauge cable (this is the same sensor used for auto-leveling on the Kobra X, not a separate limit switch). If the strain gauge checks out, the next step is opening the X-axis motor box near the toolhead to reseat the X-axis motor cable, and if that still doesn’t clear it, the printhead signal cable itself (which carries the X-axis motor wiring) may need replacing.
CODE:10119, Y-axis homing failed. Reported when the Y-axis motor driver doesn’t see a stall signal during homing. Anycubic frames this as needing further investigation on their support side, meaning the wiki entry is thinner than the X and Z equivalents. Start with a visual check of the Y-belt tension and motor cable before contacting support.
CODE:10120, Z-axis homing failed. Same family as 10118 but for the Z motor. Jog the Z-axis from the screen first. If it won’t move, tilt the machine, remove the base cover, and reseat both ends of the Z-axis motor cable. If the Z motor runs fine but the error persists, the fault is likely the strain gauge again (same disassembly as above), and as a last resort Anycubic’s guide walks through disassembling the gantry frame to swap the Z-axis motor.
CODE:10130, Z-axis homing failed (pressure sensor variant). A related but distinct code: here the printhead’s pressure sensor isn’t returning a value during zeroing. It shares root causes with 10120 (strain gauge and its cabling) but Anycubic notes this needs case-by-case investigation, so if reseating the strain gauge cable doesn’t fix it, export a log and send it to support rather than guessing further.
CODE:10126 / 10127, X or Y-axis vibration compensation abnormal. These relate to belt tension rather than homing. Anycubic’s cause description points to the belt being too loose on the affected axis; tighten it and retest before assuming a sensor fault.
CODE:10128, X-axis vibration compensation abnormal (sensor variant). If tightening the belt doesn’t help, this one points at the onboard accelerometer and its wiring rather than the belt itself.
Heating and thermistor errors
CODE:10121, Hotbed heating abnormal and CODE:10122, Extruder heating abnormal. Both mean the bed or hotend isn’t reaching temperature on schedule. Power off and check the heating element and its wiring before running another job; don’t just retry the print, since a heater that intermittently fails can still damage a print or, in a worse case, indicate a wiring fault worth catching early.
CODE:10123, Hotbed NTC abnormal and CODE:10124, Extruder NTC abnormal. These are thermistor faults rather than heater faults, the printer isn’t getting a temperature reading at all. Check the thermistor connector on the bed or hotend for a loose pin.
CODE:10415, Heated bed temperature too high. Anycubic attributes this to the NTC or the mainboard’s AC control circuit malfunctioning. This one is treated as a shutdown-and-inspect situation rather than a user fix, power the machine off and check the circuit before running it again.
CODE:10411, TMC or extruder overheat. Caused by poor heat dissipation around the mainboard driver chips tripping thermal protection. Check that the mainboard’s cooling fan is spinning and that the control box vents aren’t blocked or caked in dust.
ACE GEN2 filament and feeding errors
This is the category that’s genuinely different from the plain Kobra 2/3 guides on this site, because the Kobra X’s multi-material hardware lives inside the machine and toolhead rather than in an external ACE Pro box.
CODE:11518, Filament clogging detected. The most common of this group. Anycubic’s fix is layered: first check the digital tube display to identify which feed channel is clogged, inspect the filament tip for thinning or gaps and trim it before reinserting, and try Resume Printing. If the filament won’t clear the feed rack opening, the upper channel assembly comes off with two screws to physically pull the jam. If none of that restores extrusion, the guide moves to manual extrusion at the nozzle (E+ on the screen with the hotend at 250C) and, failing that, clearing the nozzle with a steel needle.
CODE:11853, Channel 3 retraction abnormal. A Kobra X-specific code tied to a numbered feed channel failing to retract. This one is a genuine toolhead teardown: manually pull the filament after releasing the PTFE quick connector, check for a nozzle clog with a steel needle, and if that doesn’t clear it, remove the printhead front cover, nozzle, and heatsink to physically extract broken filament with tweezers. Anycubic’s own guide notes that if the internal damping spring plates in the reversing mechanism are visibly worn, that’s a parts issue to raise with your retailer rather than something to force through.
CODE:11519, Filament tangle detected and CODE:11511 / 11512, Extrusion or retraction abnormal. All three share a cause: filament tangled in the feed mechanism, or filament that’s slightly undersized so the drive gear can’t grip it consistently. Untangle the spool path and check filament diameter consistency before blaming the printer.
CODE:11521, Color engine motor rotation abnormal. The feed box motor failed to home. Power-cycle the ACE unit specifically, not just the printer.
CODE:11529 / 11530, ACE NTC or PTC abnormal. Thermistor or PTC heater faults inside the filament drying/feed unit. Check wiring with the unit powered off.
CODE:11525, Filament count doesn’t meet model requirements and CODE:11531, More than 8 colors in the slice. Both are slicer-side mismatches, not hardware faults. Recheck how many filament slots your model actually calls for against what’s loaded.
CODE:10537, Nozzle size mismatch. The nozzle diameter set in the slicer doesn’t match what’s configured on the printer itself. Check both settings agree before reprinting.
Mainboard, driver, and communication errors
CODE:11412, mainboard MCU and driver MCU disconnected. Anycubic describes this simply as the main controller losing contact with the host controller. Restart first. If it recurs, tilt the machine, open the base cover, and reseat the mainboard cabling. If it still won’t clear, export the fault log (Settings > General > Export Log to a USB drive) and send the resulting AcLog file to support.
CODE:10409, Device operation abnormal. A catch-all for lost communication between the mainboard and either the printhead board or the ACE unit. Restart first, then check the printhead’s rear cover for a loose signal cable, then check the base wiring, in that order. The log export step applies here too if nothing else works.
CODE:11813, Power supply error. Anycubic attributes this to the hotbed control board’s over-current or over-voltage protection tripping. Power the printer off; this is one of the few codes where continuing to run the machine isn’t advisable until it’s checked.
CODE:11817, E-axis motor module possible short circuit and CODE:11819, poor motor cable contact. Both point at the extruder motor wiring, either damaged insulation causing a short or a connector that’s not seated. Both require opening the base cover to inspect and reseat the relevant motor cable.
CODE:11407, device fails to start. Caused by a loose printhead connection cable interrupting mainboard-to-printhead communication. Same fix family as 10409, reseat the signal cable.
Network, storage, and camera errors
CODE:11101, Wi-Fi connection failed. Almost always a wrong password. Re-enter it carefully; Anycubic doesn’t document a hardware fix path for this code, which suggests it’s meant to be a straightforward retry, not a repair.
CODE:10801 to 10805, covering firmware download and update failures, insufficient onboard memory, failed USB mounting, and firmware verification failures, are all update-pipeline errors. Check your network connection first, then try updating over USB with a freshly formatted, small-capacity flash drive rather than Wi-Fi if downloads keep timing out.
CODE:11001 / 11831, failed to delete local file. Usually a full or corrupted local storage partition. Clear old files from the printer’s internal storage through the touchscreen file manager.
CODE:11801, foreign object / “fried noodles” detected and CODE:11802, foreign object on the print area. These come from the Kobra X’s camera-based AI print monitoring, not a mechanical fault. The printer paused because it thinks it sees debris or a failed print on the bed. Check the bed, clear it if needed, and resume; if it triggers on a clean bed repeatedly, the camera or its calibration may need attention.
When to stop and call Anycubic support
A few situations in this list are not worth pushing through on your own. If a code (10415, 11813) explicitly involves overheating or power protection tripping, don’t keep restarting the print hoping it clears itself, that’s the machine telling you a heater, driver, or power circuit is out of spec. If you’ve gone through Anycubic’s documented cable-reseating and reslicing steps for a communication code (10409, 11412, 10120) and it’s still recurring, export the fault log rather than repeating the same disassembly a third time. It’s a genuinely useful step: Settings > General > Export Log writes an AcLog file to a USB drive that Anycubic’s support team can read directly, and it saves you from having to describe a fault secondhand. And if a repair path involves replacing a motor, a strain gauge assembly, or a signal cable and the printer is still under warranty, do that through your retailer or Anycubic support rather than voiding coverage over a part that should be replaced for free.
For the equivalent index on Anycubic’s other current models, see the Anycubic Kobra 2 Error Message Index, the Anycubic Kobra 3 error code index, or the Anycubic Kobra 3 Max Error Code Index, none of which share the Kobra X’s ACE GEN2 hardware.
Research note: this index reflects what Anycubic’s wiki documents for the Kobra X specifically, cross-checked against each code’s model tags on wiki.anycubic.com/en/error-codes. Anycubic marks that index page as still under construction, and a few codes (10119, 10130, and some of the ACE-related timeout codes) have a documented cause but no detailed step-by-step fix published yet. Where that’s true above, it’s noted rather than papered over with invented steps.