# Optics test question

**URL:** <https://forum.formlabs.com/t/optics-test-question/29006>\
**Category:** Form 2\
**Created:** [October 9, 2020, 1:55am UTC](https://forum.formlabs.com/t/optics-test-question/29006 "2020-10-09T01:55:46Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![darbyvet](https://avatars.discourse-cdn.com/v4/letter/d/e5b9ba/32.png) [@darbyvet](https://forum.formlabs.com/u/darbyvet)\
**Post date:** [October 9, 2020, 1:55am UTC](https://forum.formlabs.com/t/optics-test-question/29006/1 "2020-10-09T01:55:47Z")

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I have a question about the optics test print. I just tried running the opitcs test.I currently have tough 2000 resin and an LT tank.Only the number 2 printed in the columns and they looked weird compared to the ones I pritned in clear.

Is the optics test valid for tough 2000 resin? I will post some pictures of the test result.

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**Author:** ![darbyvet](https://avatars.discourse-cdn.com/v4/letter/d/e5b9ba/32.png) [@darbyvet](https://forum.formlabs.com/u/darbyvet)\
**Post date:** [October 9, 2020, 2:31am UTC](https://forum.formlabs.com/t/optics-test-question/29006/2 "2020-10-09T02:31:27Z")

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pictures

 ![IMG_2501](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/5/6/5608ef8951d5ee74e456eef18ea0d0033c59f2bd.JPG) ![IMG_2505](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/2/3/239f0092766ae4049b0260d06b03df32d1a3c94f.JPG)

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**Author:** ![rkagerer](https://avatars.discourse-cdn.com/v4/letter/r/439d5e/32.png) [@rkagerer](https://forum.formlabs.com/u/rkagerer)\
**Post date:** [October 9, 2020, 11:48pm UTC](https://forum.formlabs.com/t/optics-test-question/29006/3 "2020-10-09T23:48:20Z")

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Ouch. I haven’t used Tough 2000 on a Form 2 but that does not look right.

In the Optics Test file those towers are incrementally overcured (you can see that if you start deleting bits of them in Preform - IIRC some portions are duplicated or triplicated). Do you get the same effect if you just print a plain old model in one corner of your platform?

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**Author:** ![darbyvet](https://avatars.discourse-cdn.com/v4/letter/d/e5b9ba/32.png) [@darbyvet](https://forum.formlabs.com/u/darbyvet)\
**Post date:** [October 13, 2020, 3:56pm UTC](https://forum.formlabs.com/t/optics-test-question/29006/4 "2020-10-13T15:56:27Z")

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It was a dirty mirror issue. Once I cleaned the galvo mirros I got perfect prints again.it seems like where I keep my form2 is a bit dusty and I need to clean the galvo mirrors every 4-6 months

Carl