Diagnostic group

Klipper errors

Start from the exact error text. The first log line usually matters more than the visible print defect.

8 diagnostic pages First test Save klippy.log context, then run the safe idle or motion test on the page. Stop after one useful signal

Start here

Open the page that matches your evidence most closely.

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Klipper errors Klipper CAN Bus Troubleshooting Save 60 seconds before and 30 seconds after the timestamp. Klipper errors Klipper Heater Not Heating Fix Save 60 seconds before and 30 seconds after the timestamp. Klipper errors Klipper Lost Communication With MCU Copy the exact klippy.log lines and classify whether the first relevant message is USB, CAN, serial reset, or generic lost communication. Klipper errors Klipper MCU Shutdown Fix Copy the exact console message and inspect klippy.log around the shutdown timestamp before editing printer.cfg.

Klipper CAN toolboards, USB-CAN adapters, toolhead boards

Klipper CAN Bus Troubleshooting

Klipper CAN Bus Troubleshooting: capture the exact Klipper error and isolate log, config, wiring, heater, host, or MCU causes before editing printer.cfg.

Save 60 seconds before and 30 seconds after the timestamp. Klipper hotends, heated beds, thermistors

Klipper Heater Not Heating Fix

Klipper Heater Not Heating Fix: capture the exact Klipper error and isolate log, config, wiring, heater, host, or MCU causes before editing printer.cfg.

Save 60 seconds before and 30 seconds after the timestamp. Klipper, MCU, USB serial, CAN toolboards, Raspberry Pi

Klipper Lost Communication With MCU

Diagnose Klipper lost communication with MCU by separating USB serial reset, CAN disconnect, power drop, cable strain, host load, and firmware/config mismatch.

Save 60 seconds before and 30 seconds after the timestamp. Klipper, Moonraker, Raspberry Pi, USB and CAN toolboards

Klipper MCU Shutdown Fix

Diagnose Klipper MCU shutdown by exact error text: lost communication, timer too close, ADC out of range, heater not heating, CAN/USB reset, webhooks shutdown, or config edit.

Save klippy.log and run idle plus short safe motion test while watching link stability. Klipper, Raspberry Pi, high-speed printing, CoreXY

Klipper Timer Too Close During Print

Diagnose Klipper timer too close during a print by matching the log evidence to host load, USB/CAN communication, acceleration, macros, or recent config changes.

Save 60 seconds before and 30 seconds after the timestamp. Klipper hosts, Raspberry Pi, high-speed printing

Klipper Timer Too Close Fix

Klipper Timer Too Close Fix: capture the exact Klipper error and isolate log, config, wiring, heater, host, or MCU causes before editing printer.cfg.

Save 60 seconds before and 30 seconds after the timestamp. Klipper bed mesh, start macros, adaptive mesh

Klipper Bed Mesh Not Applied

Klipper Bed Mesh Not Applied: capture the exact Klipper error and isolate log, config, wiring, heater, host, or MCU causes before editing printer.cfg.

Save 60 seconds before and 30 seconds after the timestamp. Klipper probes, BLTouch, klicky, inductive probes

Klipper Probe Triggered Before Move

Klipper Probe Triggered Before Move: capture the exact Klipper error and isolate log, config, wiring, heater, host, or MCU causes before editing printer.cfg.

Save 60 seconds before and 30 seconds after the timestamp.