# I couldnt define my extrusion as an object

**URL:** <https://discourse.mcneel.com/t/i-couldnt-define-my-extrusion-as-an-object/76626>\
**Category:** Grasshopper\
**Tags:** rhino, grasshopper\
**Created:** [December 22, 2018, 3:14pm UTC](https://discourse.mcneel.com/t/i-couldnt-define-my-extrusion-as-an-object/76626 "2018-12-22T15:14:36Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![habibbass.hg](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/habibbass.hg/32/129747_2.png) [@habibbass.hg](https://discourse.mcneel.com/u/habibbass.hg)\
**Post date:** [December 22, 2018, 3:14pm UTC](https://discourse.mcneel.com/t/i-couldnt-define-my-extrusion-as-an-object/76626/1 "2018-12-22T15:14:36Z")

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Hi , I am new user of Rhino and Grasshopper , I am trying to extrude black region of qr code , i achieve it thanks to Laurent Delrieu’s work but for example when i want to save it as an STL file there is an error like there is no object in your work. How can i define my extrusion as an object. Thanks for your replies 🙂

here is my work;

 ![1](https://global.discourse-cdn.com/mcneel/original/3X/a/c/ac86c2408184bdf44a147a3f06b0aa070da811a2.jpeg)

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**Author:** ![tim.stark](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/tim.stark/32/704108_2.png) [@tim.stark](https://discourse.mcneel.com/u/tim.stark)\
**Post date:** [December 22, 2018, 3:26pm UTC](https://discourse.mcneel.com/t/i-couldnt-define-my-extrusion-as-an-object/76626/2 "2018-12-22T15:26:24Z")

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Did you backed the geometry before exporting?

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**Author:** ![habibbass.hg](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/habibbass.hg/32/129747_2.png) [@habibbass.hg](https://discourse.mcneel.com/u/habibbass.hg)\
**Post date:** [December 22, 2018, 3:35pm UTC](https://discourse.mcneel.com/t/i-couldnt-define-my-extrusion-as-an-object/76626/3 "2018-12-22T15:35:24Z")

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thanks for your reply , Since i am new , i do not know how to use these programs exactly , how can i do that? ( Sorry for simple questions 😃 )

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**Author:** ![tim.stark](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/tim.stark/32/704108_2.png) [@tim.stark](https://discourse.mcneel.com/u/tim.stark)\
**Post date:** [December 22, 2018, 4:29pm UTC](https://discourse.mcneel.com/t/i-couldnt-define-my-extrusion-as-an-object/76626/4 "2018-12-22T16:29:24Z")

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right click on your extrusion output and “bake” to rhino document. as long as you didn’t do it, its just a preview in rhino not an actual object.

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**Author:** ![xofotuw](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/xofotuw/32/72811_2.png) [@xofotuw](https://discourse.mcneel.com/u/xofotuw)\
**Post date:** [December 22, 2018, 4:53pm UTC](https://discourse.mcneel.com/t/i-couldnt-define-my-extrusion-as-an-object/76626/5 "2018-12-22T16:53:08Z")

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You need to right-click the ‘Extrusion’ button then ‘Bake’ it to make it available in Rhino viewport

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**Author:** ![habibbass.hg](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/habibbass.hg/32/129747_2.png) [@habibbass.hg](https://discourse.mcneel.com/u/habibbass.hg)\
**Post date:** [December 22, 2018, 6:21pm UTC](https://discourse.mcneel.com/t/i-couldnt-define-my-extrusion-as-an-object/76626/7 "2018-12-22T18:21:33Z")

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thank u so much