# Sandbox/Segment Cross-section area

**URL:** <https://discourse.slicer.org/t/sandbox-segment-cross-section-area/19794>\
**Category:** Support\
**Tags:** extensions-manager\
**Created:** [September 21, 2021, 11:19pm UTC](https://discourse.slicer.org/t/sandbox-segment-cross-section-area/19794 "2021-09-21T23:19:48Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![hhart](https://avatars.discourse-cdn.com/v4/letter/h/58f4c7/32.png) [@hhart](https://discourse.slicer.org/u/hhart)\
**Post date:** [September 21, 2021, 11:19pm UTC](https://discourse.slicer.org/t/sandbox-segment-cross-section-area/19794/1 "2021-09-21T23:19:48Z")

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I am new to using 3d slicer. I would like to use the segment cross-section area tool. From what I understand, I need to install the sandbox extension. I have gone through all the extensions listed in the extension manager but can’t seem to find the sandbox. I have watched a couple of tutorial videos—in those videos when you search for sandbox it shows up in the examples, but when I search for it nothing comes up. Is this extension still available? If not, is there another method for calculating CSA in slicer.

I’m using 4.11.20210226 mac version.

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**Author:** ![hhart](https://avatars.discourse-cdn.com/v4/letter/h/58f4c7/32.png) [@hhart](https://discourse.slicer.org/u/hhart)\
**Post date:** [September 22, 2021, 1:56pm UTC](https://discourse.slicer.org/t/sandbox-segment-cross-section-area/19794/2 "2021-09-22T13:56:46Z")

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Ok, figured it out. I downloaded the preview version—it has the sandbox extension.

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**Author:** ![hherhold](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/hherhold/32/12199_2.png) [@hherhold](https://discourse.slicer.org/u/hherhold)\
**Post date:** [September 22, 2021, 2:00pm UTC](https://discourse.slicer.org/t/sandbox-segment-cross-section-area/19794/3 "2021-09-22T14:00:19Z")

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Sorry for the slow reply. Yes, you should be using the latest preview unless there is an overriding reason to use 4.11 (somewhat uncommon).