# Layer lines due to decreased laser strength - Clean galvos again?

**URL:** <https://forum.formlabs.com/t/layer-lines-due-to-decreased-laser-strength-clean-galvos-again/23481>\
**Category:** Form 2\
**Created:** [May 23, 2019, 2:59pm UTC](https://forum.formlabs.com/t/layer-lines-due-to-decreased-laser-strength-clean-galvos-again/23481 "2019-05-23T14:59:47Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![JohnHue](https://avatars.discourse-cdn.com/v4/letter/j/48db29/32.png) [@JohnHue](https://forum.formlabs.com/u/JohnHue)\
**Post date:** [May 24, 2019, 7:51am UTC](https://forum.formlabs.com/t/layer-lines-due-to-decreased-laser-strength-clean-galvos-again/23481/2 "2019-05-24T07:51:54Z")

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Has Support asked you to print this ?

> [@Disassembling and Reassembling of the Form 2 / re-calibrating Tank-Tray](http://forum.formlabs.com/t/disassembling-and-reassembling-of-the-form-2-re-calibrating-tank-tray/15232/14):
>
> [OPTICS\_Test.form](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/5/55718e1ea6e16022b738927aa4be1b7cdc4593a8.form) (274.2 KB) Optics test file attached. Chris

If not you should do so, it’s a very good way to see if the optical surfaces are clean or not.

If the pillars loot like this it’s not good :  
[![](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/d/d5dc15093048ad55710797928b0f497adbc1fec2.jpg) ](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/d/d5dc15093048ad55710797928b0f497adbc1fec2.jpg)

If they look like this you’re fine :  
[![](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/1/1180b250ef4ca4c796dd60ee5c817be1fec832f8.jpg) ](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/1/1180b250ef4ca4c796dd60ee5c817be1fec832f8.jpg)

I would also recommend looking at this page for cleaning methods :  
[https://www.thorlabs.com/newgrouppage9.cfm?objectgroup\_id=9025](https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=9025)

In particular the “Drop and Drag Method” which is dead efficient. I have never had to remove the galvo blocks to clean my machines but it’s definitely more challenging.

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