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diff --git a/docs/FAQ.md b/docs/FAQ.md index 2c7af7c7..609213b3 100644 --- a/docs/FAQ.md +++ b/docs/FAQ.md @@ -21,7 +21,8 @@ Frequently asked questions 18. [How do I convert a Marlin pin number to a Klipper pin name?](#how-do-i-convert-a-marlin-pin-number-to-a-klipper-pin-name) 19. [How do I cancel an M109/M190 "wait for temperature" request?](#how-do-i-cancel-an-m109m190-wait-for-temperature-request) 20. [Can I find out whether the printer has lost steps?](#can-i-find-out-whether-the-printer-has-lost-steps) -21. [How do I upgrade to the latest software?](#how-do-i-upgrade-to-the-latest-software) +21. [Why does Klipper report errors? I lost my print!](#why-does-klipper-report-errors-i-lost-my-print) +22. [How do I upgrade to the latest software?](#how-do-i-upgrade-to-the-latest-software) ### How can I donate to the project? @@ -414,6 +415,36 @@ only lose steps in increments of 4 full steps. (So, if one is using 16 microsteps, then a lost step on the stepper would result in the "mcu:" step counter being off by a multiple of 64 microsteps.) +### Why does Klipper report errors? I lost my print! + +Short answer: We want to know if our printers detect a problem so that +the underlying issue can be fixed and we can obtain great quality +prints. We definitely do not want our printers to silently produce low +quality prints. + +Long answer: Klipper has been engineered to automatically workaround +many transient problems. For example, it automatically detects +communication errors and will retransmit; it schedules actions in +advance and buffers commands at multiple layers to enable precise +timing even with intermittent interference. However, should the +software detect an error that it can not recover from, if it is +commanded to take an invalid action, or if it detects it is hopelessly +unable to perform its commanded task, then Klipper will report an +error. In these situations there is a high risk of producing a +low-quality print (or worse). It is hoped that alerting the user will +empower them to fix the underlying issue and improve the overall +quality of their prints. + +There are some related questions: Why doesn't Klipper pause the print +instead? Report a warning instead? Check for errors before the print? +Ignore errors in user typed commands? etc? Currently Klipper reads +commands using the G-Code protocol, and unfortunately the G-Code +command protocol is not flexible enough to make these alternatives +practical today. There is developer interest in improving the user +experience during abnormal events, but it is expected that will +require notable infrastructure work (including a shift away from +G-Code). + ### How do I upgrade to the latest software? The first step to upgrading the software is to review the latest |