# Printer goes clunk

**URL:** <https://forum.formlabs.com/t/printer-goes-clunk/1044>\
**Category:** Support & Troubleshooting\
**Created:** [April 7, 2014, 6:31pm UTC](https://forum.formlabs.com/t/printer-goes-clunk/1044 "2014-04-07T18:31:17Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![HajeJanKamps](https://avatars.discourse-cdn.com/v4/letter/h/b3f665/32.png) [@HajeJanKamps](https://forum.formlabs.com/u/HajeJanKamps)\
**Post date:** [April 7, 2014, 6:31pm UTC](https://forum.formlabs.com/t/printer-goes-clunk/1044/1 "2014-04-07T18:31:17Z")

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I started a print this afternoon, and my printer seems to have developed a fault - whenever it does the peel between layers, it makes a very loud ‘clunk’ sound, and when it does, it looks as if the resin tank drops around 1-2cm all of a sudden.

I recorded a video of it before I stopped the print: [https://www.youtube.com/watch?v=bBVLSV5gzwY](https://www.youtube.com/watch?v=bBVLSV5gzwY)

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**Author:** ![id647980948](https://avatars.discourse-cdn.com/v4/letter/i/5f9b8f/32.png) [@id647980948](https://forum.formlabs.com/u/id647980948)\
**Post date:** [April 7, 2014, 6:46pm UTC](https://forum.formlabs.com/t/printer-goes-clunk/1044/2 "2014-04-07T18:46:55Z")

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That is totally normal operation. A vacuum is created during peeling a large flat surface (usually the base). After that it should go away and it will not harm your prints.

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**Author:** ![HajeJanKamps](https://avatars.discourse-cdn.com/v4/letter/h/b3f665/32.png) [@HajeJanKamps](https://forum.formlabs.com/u/HajeJanKamps)\
**Post date:** [April 7, 2014, 7:49pm UTC](https://forum.formlabs.com/t/printer-goes-clunk/1044/3 "2014-04-07T19:49:07Z")

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Phew, that makes sense. Thank you for the explanation! I’ll give it another try now.

~Haje

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**Author:** ![ScottJanousek](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/scottjanousek/32/2582_2.png) [@ScottJanousek](https://forum.formlabs.com/u/ScottJanousek)\
**Post date:** [April 8, 2014, 3:10am UTC](https://forum.formlabs.com/t/printer-goes-clunk/1044/4 "2014-04-08T03:10:11Z")

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There is another video which documents the boot sounds, which can also sound like anomalies (but are not).

[https://support.formlabs.com/entries/39223716-Sounds-of-the-Form-1](https://support.formlabs.com/entries/39223716-Sounds-of-the-Form-1)

Might make sense to document the peel process there as well. It does sound a bit odd for first time print jobs if you’re not used to the bot yet.

-sj