5 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
Costly or dangerous
Kobra 3 error 10124: print head NTC thermistor signal failure stops heating
Anycubic's official wiki documents error 10124, where the printer detects abnormal NTC thermistor resistance/signal and stops heating. The wiki warns that forcing heating with a faulty NTC could cause temperature runaway and damage the print head. This is a protective shutdown but leaves the printer unusable until the sensor or cabling is fixed.
What to check. If error 10124 appears, the printer will refuse to heat. Check the NTC ribbon cable and print head connector first; if the sensor itself is faulty it must be replaced (NTC 100K). Do not bypass the protection.
Anycubic's official wiki documents error 10237, an auto-leveling failure requiring inspection of the strain gauge assembly. The wiki warns that if the hot bed touches the hot end and cannot be paused, the user must immediately power off to avoid damage. This indicates the leveling sensor is a known failure point.
What to check. If auto-leveling fails with error 10237, the strain gauge assembly may be faulty. The wiki warns of potential damage if the bed contacts the hotend during a sensor failure — power off immediately. Sensor repair requires disassembling the print head housing.
Kobra 3 error 11519: filament tangle/jam in extruder gears or buffer mechanism
Anycubic's official wiki documents error 11519, a filament tangle/jam detection. The wiki notes that filament that is too thin can cause the extruder gear to fail to advance it, and that filament can get stuck in the gears or the buffer mechanism, requiring disassembly of the extruder or buffer to extract. This is a known failure mode on the Kobra 3 Combo.
What to check. Use quality filament of consistent diameter; undersized filament can trigger error 11519. If filament jams in the gears or buffer, recovery requires disassembling the extruder cover or buffer mechanism with hex wrenches.
Kobra 3 hotend clogging is a common problem requiring disassembly to clear
Anycubic's official wiki acknowledges hotend clogging as a common problem on the Kobra 3, listing causes such as damaged nozzle, insufficient hotend temperature, and abrasive filaments like carbon fiber or glow-in-the-dark. Clearing a clog requires disassembling the hotend and using a needle or hex wrench, which is time-consuming.
What to check. Expect hotend clogs, especially with abrasive filaments. The official cleaning procedure requires disassembly and tools (S1.5 hex wrench, needle). Budget for maintenance time and possibly replacement hotends.
Kobra 3 layer shift after ~1500 hours of printing (owner report)
A French owner reports a layer offset of 0.2mm appearing after ~1500 hours of printing on their Kobra 3, constant around the part and starting at a certain height. The user tested multiple slicer versions, replaced the hotend with a ceramic one, and reset the printer, but the issue persisted until changing wall order in the slicer. This suggests mechanical wear or Z-axis issues after extended use.
What to check. After heavy use (~1500h), layer shifting can appear. The owner found partial mitigation by changing wall print order in the slicer. If you buy used or plan long-term use, budget for mechanical wear on the Z-axis or print head.
These reports come from the pages linked under each item: owner forums, repair guides and workshops. They are not a diagnosis of any one unit, and a careful check of the one you are buying still applies.
Text from the Kriko 3D printers catalog, version 0.1.1, under the CC-BY-SA-4.0 license.
