M43 (endstop states) or M119 – shows if probe is triggered. For analog probe: M43 S to see raw ADC value.
The "Scan error thread 0 please fill something in 100" message is intimidating, but it is not necessarily a death sentence for your data. It is a signal that the drive is struggling to communicate specific blocks of data.
In firmware, reduce XY_PROBE_SPEED and Z_PROBE_SPEED_FAST . Sometimes a fast move makes the probe miss the bed contact. scan error thread 0 please fill something in 100
To resolve the "Scan Error Thread 0" error, try the following steps:
This exact phrase is rare and appears in (e.g., some Chinese printer boards with custom debug output). M43 (endstop states) or M119 – shows if probe is triggered
| Step | Action | |------|--------| | 1 | Reboot printer and home ( G28 ) | | 2 | Deploy probe manually – check physical movement | | 3 | Run M119 – verify probe state changes when triggered | | 4 | Reduce probe feedrate | | 5 | Recompile firmware with proper probe limits | | 6 | Reset EEPROM | | 7 | If problem persists, probe hardware likely faulty |
This error typically occurs on Epson printers, but it can also appear on other models. Don't worry; I'm here to help you troubleshoot and resolve the issue. It is a signal that the drive is
If you are encountering this error, try the following solutions in order: 1. Verify Input Data
If none of the above steps resolve the "Scan Error Thread 0" error, it's possible that there's a hardware issue with your scanner. You may want to:
In some cases, simply ( M502 then M500 ) and re‑running bed leveling solves it.