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Diffstat (limited to 'docs/Measuring_Resonances.md')
| -rw-r--r-- | docs/Measuring_Resonances.md | 18 |
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diff --git a/docs/Measuring_Resonances.md b/docs/Measuring_Resonances.md index 6c58409b..d6aaf567 100644 --- a/docs/Measuring_Resonances.md +++ b/docs/Measuring_Resonances.md @@ -694,6 +694,24 @@ If you are doing a shaper re-calibration and the reported smoothing for the suggested shaper configuration is almost the same as what you got during the previous calibration, this step can be skipped. +### Unreliable measurements of resonance frequencies + +Sometimes the resonance measurements can produce bogus results, leading to +the incorrect suggestions for the input shapers. This can be caused by a +variety of reasons, including running fans on the toolhead, incorrect +position or non-rigid mounting of the accelerometer, or mechanical problems +such as loose belts or binding or bumpy axis. Keep in mind that all fans +should be disabled for resonance testing, especially the noisy ones, and +that the accelerometer should be rigidly mounted on the corresponding +moving part (e.g. on the bed itself for the bed slinger, or on the extruder +of the printer itself and not the carriage, and some people get better +results by mounting the accelerometer on the nozzle itself). As for +mechanical problems, the user should inspect if there is any fault that +can be fixed with a moving axis (e.g. linear guide rails cleaned up and +lubricated and V-slot wheels tension adjusted correctly). If none of that +helps, a user may try the other shapers from the produced list besides the +one recommended by default. + ### Testing custom axes `TEST_RESONANCES` command supports custom axes. While this is not really |