# Horizontal Lines on Print

**URL:** <https://forum.formlabs.com/t/horizontal-lines-on-print/25622>\
**Category:** Form 2\
**Created:** [December 3, 2019, 11:06am UTC](https://forum.formlabs.com/t/horizontal-lines-on-print/25622 "2019-12-03T11:06:57Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Komodo](https://avatars.discourse-cdn.com/v4/letter/k/8491ac/32.png) [@Komodo](https://forum.formlabs.com/u/Komodo)\
**Post date:** [December 3, 2019, 11:06am UTC](https://forum.formlabs.com/t/horizontal-lines-on-print/25622/1 "2019-12-03T11:06:57Z")

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Hi,

I’m getting lines randomly in the z axis using Black V4 sliced at 100microns. The printer sometimes throws a resin sensor error and pauses for a while until I do something with the cartridge. But these lines are left behind. This print only stopped once that I saw for resin sensor issues, but there are multiple lines on the print.

Any ideas?

 ![fullsizeoutput_3046](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/8/8a653ba4127fbc782eb80635bf8fc0af6352d64d.jpeg)

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**Author:** ![Frida](https://avatars.discourse-cdn.com/v4/letter/f/57b2e6/32.png) [@Frida](https://forum.formlabs.com/u/Frida)\
**Post date:** [December 3, 2019, 1:10pm UTC](https://forum.formlabs.com/t/horizontal-lines-on-print/25622/2 "2019-12-03T13:10:29Z")

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Hello Komodo,  
it can be the sensoring issue but more or less i see the problem more at the galvo mirrors.  
If you try to clean them, don’t follow the Formlabs directions cleaning them with IPA!  
Get yourself a cleaning kit for ccd chips like in a digital SLR camera. So you can not ruin your mirrors.

Best  
Peter

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**Author:** ![DKirch](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/dkirch/32/20300_2.png) [@DKirch](https://forum.formlabs.com/u/DKirch)\
**Post date:** [December 3, 2019, 3:37pm UTC](https://forum.formlabs.com/t/horizontal-lines-on-print/25622/3 "2019-12-03T15:37:25Z")

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Definitely recommend speaking to our support team, and they’d be happy to point you in the right direction to get this issue resolved as efficiently as possible. 🙂

[https://support.formlabs.com/s/contact-support?language=en\_US](https://support.formlabs.com/s/contact-support?language=en_US)

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**Author:** ![fantasy2](https://avatars.discourse-cdn.com/v4/letter/f/a88e4f/32.png) [@fantasy2](https://forum.formlabs.com/u/fantasy2)\
**Post date:** [December 3, 2019, 4:46pm UTC](https://forum.formlabs.com/t/horizontal-lines-on-print/25622/4 "2019-12-03T16:46:01Z")

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You seem to have a mechanical issue, has nothing to do with dirty mirrors.  
Best to contact support for some fault finding.

Have you already tried printing a cylinder directly from the base up without cartridge error interruptions in between?

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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:** [December 10, 2019, 4:46pm UTC](https://forum.formlabs.com/t/horizontal-lines-on-print/25622/5 "2019-12-10T16:46:07Z")

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Closed on December 10, 2019, 4:46pm UTC

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