# Whistling noise after cleaning galvo mirrors

**URL:** <https://forum.formlabs.com/t/whistling-noise-after-cleaning-galvo-mirrors/8720>\
**Category:** Support & Troubleshooting\
**Created:** [June 24, 2016, 3:37am UTC](https://forum.formlabs.com/t/whistling-noise-after-cleaning-galvo-mirrors/8720 "2016-06-24T03:37:07Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![sherifeid](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/sherifeid/32/6442_2.png) [@sherifeid](https://forum.formlabs.com/u/sherifeid)\
**Post date:** [June 24, 2016, 3:37am UTC](https://forum.formlabs.com/t/whistling-noise-after-cleaning-galvo-mirrors/8720/1 "2016-06-24T03:37:07Z")

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I cleaned my form 1+ galvo and small mirrors today, after that the printer starting humming with a high pitch whistle that wasn’t there before. The print seems to be going normal but it’s just that annoying whistle, did anyone have this problem before ?

[https://youtu.be/ieHY63DScJM](https://youtu.be/ieHY63DScJM)

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**Author:** ![sherifeid](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/sherifeid/32/6442_2.png) [@sherifeid](https://forum.formlabs.com/u/sherifeid)\
**Post date:** [June 24, 2016, 6:04am UTC](https://forum.formlabs.com/t/whistling-noise-after-cleaning-galvo-mirrors/8720/2 "2016-06-24T06:04:55Z")

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I took off the back cover and put it back again, the whistle is now gone

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**Author:** ![ChristopherBarr](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/christopherbarr/32/645_2.png) [@ChristopherBarr](https://forum.formlabs.com/u/ChristopherBarr)\
**Post date:** [June 25, 2016, 3:26pm UTC](https://forum.formlabs.com/t/whistling-noise-after-cleaning-galvo-mirrors/8720/3 "2016-06-25T15:26:57Z")

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The little guy must have jumped out.

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**Author:** ![system](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/5/b/5bc2bdf993ff27c2e0eecab5010b25626fbb327a.png) [@system](https://forum.formlabs.com/u/system)\
**Post date:** [July 9, 2016, 3:30pm UTC](https://forum.formlabs.com/t/whistling-noise-after-cleaning-galvo-mirrors/8720/4 "2016-07-09T15:30:58Z")

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