# New Black Resin (version 4) very soft?

**URL:** <https://forum.formlabs.com/t/new-black-resin-version-4-very-soft/17765>\
**Category:** Form 2\
**Created:** [March 6, 2018, 7:20am UTC](https://forum.formlabs.com/t/new-black-resin-version-4-very-soft/17765 "2018-03-06T07:20:42Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Researcher](https://avatars.discourse-cdn.com/v4/letter/r/edb3f5/32.png) [@Researcher](https://forum.formlabs.com/u/Researcher)\
**Post date:** [March 6, 2018, 7:20am UTC](https://forum.formlabs.com/t/new-black-resin-version-4-very-soft/17765/1 "2018-03-06T07:20:42Z")

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Hi,

we just got a batch of version 4 black resin and the prints turned out to be very soft, nearly as soft as the flexible resin.  
With version 2 black resin printed hours before we didn`t had this problem.  
Preform and printer softw\<are/firmware are up to date.  
Did anyone else experience similar problems?

THX  
Researcher

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**Author:** ![Zachary\_Brackin](https://avatars.discourse-cdn.com/v4/letter/z/4da419/32.png) [@Zachary\_Brackin](https://forum.formlabs.com/u/Zachary_Brackin)\
**Post date:** [March 6, 2018, 4:38pm UTC](https://forum.formlabs.com/t/new-black-resin-version-4-very-soft/17765/2 "2018-03-06T16:38:38Z")

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Is it flexible after post curing?

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<div class="post-metadata">

**Author:** ![Researcher](https://avatars.discourse-cdn.com/v4/letter/r/edb3f5/32.png) [@Researcher](https://forum.formlabs.com/u/Researcher)\
**Post date:** [March 13, 2018, 8:13am UTC](https://forum.formlabs.com/t/new-black-resin-version-4-very-soft/17765/3 "2018-03-13T08:13:13Z")

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Yes, even after post curing the material is softer than the V02 material.  
The post curing makes the material a just bit harder.

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**Author:** ![Noizo](https://avatars.discourse-cdn.com/v4/letter/n/ecd19e/32.png) [@Noizo](https://forum.formlabs.com/u/Noizo)\
**Post date:** [March 13, 2018, 12:59pm UTC](https://forum.formlabs.com/t/new-black-resin-version-4-very-soft/17765/4 "2018-03-13T12:59:22Z")

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Same issue here. V4 Black resin. Printed a lot of pieces, and it seems that only small ones stay soft, and when part is big enough there are good chances it will be hard (but not always).

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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:** [March 27, 2018, 12:59pm UTC](https://forum.formlabs.com/t/new-black-resin-version-4-very-soft/17765/5 "2018-03-27T12:59:30Z")

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