# Union the revolving parts

**URL:** <https://discourse.shapr3d.com/t/union-the-revolving-parts/1589>\
**Category:** Modeling Questions\
**Created:** [October 8, 2017, 4:46am UTC](https://discourse.shapr3d.com/t/union-the-revolving-parts/1589 "2017-10-08T04:46:50Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Lue](https://avatars.discourse-cdn.com/v4/letter/l/c5a1d2/32.png) [@Lue](https://discourse.shapr3d.com/u/Lue)\
**Post date:** [October 8, 2017, 4:46am UTC](https://discourse.shapr3d.com/t/union-the-revolving-parts/1589/1 "2017-10-08T04:46:50Z")

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HI! Is there any criteria for the union function ? Apparently I must do union for printing. But I can’t select the sphere made by revolve function. This is the sample picture.  
 ![59506F22-DE22-4E55-B582-D5FF605FB313](https://cdck-file-uploads-us1.s3.dualstack.us-west-2.amazonaws.com/flex002/uploads/shapr3d/original/2X/6/66482b810ca370f5f652d146c449982a66e3481d.jpg)

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**Author:** ![Istvan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/istvan/32/23668_2.png) [@Istvan](https://discourse.shapr3d.com/u/Istvan)\
**Post date:** [October 8, 2017, 9:28am UTC](https://discourse.shapr3d.com/t/union-the-revolving-parts/1589/2 "2017-10-08T09:28:34Z")

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Hi, unfortunately this is a bug that is going to be fixed in the next version.

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**Author:** ![Lue](https://avatars.discourse-cdn.com/v4/letter/l/c5a1d2/32.png) [@Lue](https://discourse.shapr3d.com/u/Lue)\
**Post date:** [October 8, 2017, 2:53pm UTC](https://discourse.shapr3d.com/t/union-the-revolving-parts/1589/3 "2017-10-08T14:53:46Z")

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Alright,many thx