# Problem with 3D printing myocardium only

**URL:** <https://discourse.slicer.org/t/problem-with-3d-printing-myocardium-only/13136>\
**Category:** Development\
**Created:** [August 24, 2020, 6:46am UTC](https://discourse.slicer.org/t/problem-with-3d-printing-myocardium-only/13136 "2020-08-24T06:46:37Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Serena](https://avatars.discourse-cdn.com/v4/letter/s/a87d85/32.png) [@Serena](https://discourse.slicer.org/u/Serena)\
**Post date:** [August 24, 2020, 6:46am UTC](https://discourse.slicer.org/t/problem-with-3d-printing-myocardium-only/13136/1 "2020-08-24T06:46:37Z")

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Hello,  
I created an stl file for the heart myocardium only using the tutorial :[https://www.youtube.com/watch?v=55cqpl8\_b8c](https://www.youtube.com/watch?v=55cqpl8_b8c)

However when i try to 3D print it , it still comes up as a solid 3D model instead of a hollowed out heart. Could you kindly help? I am using the “Preform” software for the 3D printer.

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [August 24, 2020, 3:49pm UTC](https://discourse.slicer.org/t/problem-with-3d-printing-myocardium-only/13136/2 "2020-08-24T15:49:49Z")

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You can use Hollow effect in Segment Editor module to create hollow segments.

Note that if you use a Formlabs printer then you need to add drain holes to allow excess resin to escape from cavities.