# Trouble joining solid objects

**URL:** <https://discourse.mcneel.com/t/trouble-joining-solid-objects/15711>\
**Category:** Rhino for Windows\
**Created:** [January 16, 2015, 4:26am UTC](https://discourse.mcneel.com/t/trouble-joining-solid-objects/15711 "2015-01-16T04:26:04Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![bentfab](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/bentfab/32/15807_2.png) [@bentfab](https://discourse.mcneel.com/u/bentfab)\
**Post date:** [January 16, 2015, 4:26am UTC](https://discourse.mcneel.com/t/trouble-joining-solid-objects/15711/1 "2015-01-16T04:26:04Z")

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I’m still fairly new at Rhino, so if I’m using the wrong terminology please excuse me.

I’m having trouble joining two solids. I’ve made a water bottle using the Revolve function. I then cut it in half vertically using Wirecut so it will remain solid. I then used Extrude on the outline created when I cut the water bottle in half to create another solid.

I’ve tried using both Join and Boolean Union to join the two, but they both fail.

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**Author:** ![chuck](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/chuck/32/512984_2.png) [@chuck](https://discourse.mcneel.com/u/chuck)\
**Post date:** [January 16, 2015, 5:19am UTC](https://discourse.mcneel.com/t/trouble-joining-solid-objects/15711/2 "2015-01-16T05:19:39Z")

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You want BooleanUnion. Join only works with naked edges, so it will never do anything wth two solids. This sounds like it should work, but I can’t be sure without seeing the model before you try to do the union. Can you post the 3dm file with the two solids that you are trying to union?

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**Author:** ![bentfab](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/bentfab/32/15807_2.png) [@bentfab](https://discourse.mcneel.com/u/bentfab)\
**Post date:** [January 16, 2015, 12:44pm UTC](https://discourse.mcneel.com/t/trouble-joining-solid-objects/15711/3 "2015-01-16T12:44:47Z")

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[6’ bottle post.3dm](https://sea3.discourse-cdn.com/mcneel/uploads/default/15521/70d0890c947946ba.3dm) (550.8 KB)

Hopefully it uploaded Chuck.

But now I’m really confused. The bottle is part of a larger drawing, so I copied and paste to isolate. Before I did anything I tried to Boolean Union again and it failed. After I paste the drawing to it’s new page I tried Boolean Union one more time, and this time it worked!

What they heck? Here is the one that worked, may be you can gleam some information from it.

Thanks

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**Author:** ![pascal](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/pascal/32/479395_2.png) [@pascal](https://discourse.mcneel.com/u/pascal)\
**Post date:** [January 16, 2015, 3:53pm UTC](https://discourse.mcneel.com/t/trouble-joining-solid-objects/15711/4 "2015-01-16T15:53:11Z")

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Hi John- it’s hard to say without seeing the separate input objects, but your object in the file has an internal face that should not be there - run the Section command to see where the extra is- not what you expect, right?

![](https://sea3.discourse-cdn.com/mcneel/uploads/default/15524/309902c5a67a0d4c.png)

-Pascal