# Patch of cured resin on the build platform after every print

**URL:** <https://forum.formlabs.com/t/patch-of-cured-resin-on-the-build-platform-after-every-print/19305>\
**Category:** Form 2\
**Created:** [June 22, 2018, 1:17pm UTC](https://forum.formlabs.com/t/patch-of-cured-resin-on-the-build-platform-after-every-print/19305 "2018-06-22T13:17:22Z")\
**Posts on this page:** 1\
**Showing post:** 2

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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:** [June 22, 2018, 1:24pm UTC](https://forum.formlabs.com/t/patch-of-cured-resin-on-the-build-platform-after-every-print/19305/2 "2018-06-22T13:24:50Z")

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Had this as well. It turned out to be an optics problem.

Try this print:

> [@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

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