https://forums.autodesk.com/t5/autocad-forum/union-of-3-solids/m-p/11236697#M55327 <P>NEVER MIND I SOLVED IT !!!!!!!!!!!!!!!!&nbsp;</P><P>probably a very tiny tiny piece was not extruded correctly !</P> Wed, 15 Jun 2022 12:55:38 GMT tecnicoKJFRK 2022-06-15T12:55:38Z https://forums.autodesk.com/t5/autocad-forum/union-of-3-solids/m-p/11236685#M55326 <P>Hello everyone,&nbsp;</P><P>as you can see in the dwg file and in the screenshot I have 3 solids ( 2 which are mirrored and then one surface I extruded in order to get to the total 0.4 mm thickness total in the middle where the water is supposed to hit).</P><P>&nbsp;</P><P>How can I union those 3 solids? Never occured to me this problem and honestly I can't explain it...</P><P>On the side there still is the surface I then extruded</P><P>&nbsp;</P><P>Many thanks,</P><P>&nbsp;</P><P>Mike</P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="tecnicoKJFRK_0-1655297312899.png" style="width: 600px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1080116iF14587E0D9289681/image-size/medium?v=v2&amp;px=400" role="button" title="tecnicoKJFRK_0-1655297312899.png" alt="tecnicoKJFRK_0-1655297312899.png" /></span></P><P>&nbsp;</P> Wed, 15 Jun 2022 12:48:46 GMT https://forums.autodesk.com/t5/autocad-forum/union-of-3-solids/m-p/11236685#M55326 tecnicoKJFRK 2022-06-15T12:48:46Z https://forums.autodesk.com/t5/autocad-forum/union-of-3-solids/m-p/11236697#M55327 <P>NEVER MIND I SOLVED IT !!!!!!!!!!!!!!!!&nbsp;</P><P>probably a very tiny tiny piece was not extruded correctly !</P> Wed, 15 Jun 2022 12:55:38 GMT https://forums.autodesk.com/t5/autocad-forum/union-of-3-solids/m-p/11236697#M55327 tecnicoKJFRK 2022-06-15T12:55:38Z https://forums.autodesk.com/t5/autocad-forum/union-of-3-solids/m-p/11244700#M55328 <P>Could this be the source of the problem?&nbsp;&nbsp;<span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Union-3.PNG" style="width: 218px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1081620i4721345CE6D65E49/image-size/large?v=v2&amp;px=999" role="button" title="Union-3.PNG" alt="Union-3.PNG" /></span></P> Sun, 19 Jun 2022 15:30:12 GMT https://forums.autodesk.com/t5/autocad-forum/union-of-3-solids/m-p/11244700#M55328 mmelechinsky 2022-06-19T15:30:12Z