Basic Information: Printer Model: Troodon 2 (originally reprap, now klipper) MCU / Printerboard: Octopus X7 Host / SBC Rasp pi 5 klippy.log klippy(exception in flush handler) 10 8 25.log (312.6 KB) Fill out above information and in all cases attach your klippy.log file (use zip to compress …

The upstream Klipper repository had an error (commit b60804bb - applied on September 15th) that was recently fixed (commit c49dbb5a - applied on October 4th). The error could result in sporadic “step compress errors”. It is recommended to update to the latest code to avoid the issue. -Kevin

Definitely some similarities. In the error for sure, it looks very similar. I had looked at that prior to posting my topic, and I suppose I assumed that their issue might or would be solved through the happy hare update, which I am not using. Nevermore and led effects are up to date on my machine…

I’m marking this as solved as Kevin suggested the fix and I haven’t had issues since updating. Though to be fair I haven’t been able to print/test as much as I’d like, but I’m assuming this is solved.

Exception in flush handler

General Discussion

EddyMI3D October 8, 2025, 2:12pm 2

Is there a coincidence to this thread? Exception in flush_handler - #3 by 3dcoded

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Exception in flush_handler General Discussion	5	419	October 8, 2025
Error in syncemitter 'extruder' step generation General Discussion	10	149	June 14, 2026
Flush Handler error General Discussion	5	52	May 13, 2026
Unhandled exception during run, when starting klipper General Discussion	1	49	January 29, 2026
Problems during extrusion - fresh klipper 0.12 General Discussion	9	323	March 25, 2024

Exception in flush handler

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