# Dental lt fail

**URL:** <https://forum.formlabs.com/t/dental-lt-fail/28636>\
**Category:** Support & Troubleshooting\
**Created:** [August 28, 2020, 2:25pm UTC](https://forum.formlabs.com/t/dental-lt-fail/28636 "2020-08-28T14:25:27Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Joe4](https://avatars.discourse-cdn.com/v4/letter/j/c37758/32.png) [@Joe4](https://forum.formlabs.com/u/Joe4)\
**Post date:** [August 28, 2020, 2:25pm UTC](https://forum.formlabs.com/t/dental-lt-fail/28636/1 "2020-08-28T14:25:27Z")

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I have a form2 machine, which worked fine for almost a year. Recently I switch to Dental Lt Resin and a new tank. I have printed twice, and failed twice (like picture below). Is any solutions? Many thanks in advance.

 ![%E5%BE%AE%E4%BF%A1%E5%9B%BE%E7%89%87_20200828222358](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/5/f/5fdd4f2cf6fec6ae18eac90be3f912e5b263127e.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:** [August 29, 2020, 2:40am UTC](https://forum.formlabs.com/t/dental-lt-fail/28636/2 "2020-08-29T02:40:48Z")

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How long since your last successful print? Could be dust accumulation somewhere in the optical path. Start by inspecting and [cleaning the optical window](https://support.formlabs.com/s/article/Cleaning-the-Glass-Optical-Window-Form2). If you [open a ticket with Support](https://support.formlabs.com/s/contact-support), they’ll provide more personalized suggestions and (if neccessary) instruct you on inspection and cleaning of the mirror / galvos.

Could also be due to the size, geometry or orientation of your part. You could try doing an optics test and see if that prints. Before attempting a new print with that tank you’ll want to follow the steps to [clean up after a failed print](https://support.formlabs.com/s/article/Cleaning-after-a-Failed-Print-Form2). Also remember to always shake the cartridge before putting it in the printer.

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**Author:** ![Joe4](https://avatars.discourse-cdn.com/v4/letter/j/c37758/32.png) [@Joe4](https://forum.formlabs.com/u/Joe4)\
**Post date:** [August 30, 2020, 5:55am UTC](https://forum.formlabs.com/t/dental-lt-fail/28636/3 "2020-08-30T05:55:33Z")

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Thanks for your kind reply. It’s not the optical path problem. I tried a new cartridge of dental sg resin, and turned out fine. It’s the Dental Lt resin thing. Thanks again

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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:** [September 13, 2020, 5:55am UTC](https://forum.formlabs.com/t/dental-lt-fail/28636/4 "2020-09-13T05:55:42Z")

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