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I'm working on a ring I am willing to print out. I've sent my stl export to the printing place, but they claim that mesh I've sent consists of 3 separate objects. But when I'm working on blender, everything appears to be one solid object. The ring was created from 3 loops joined by boolean union modifier. enter image description here

This is how other software sees my file enter image description here

Does anyone know how else can I join it ?

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    $\begingroup$ Select it, go into edit mode, press P (Separate) and choose By Loose Parts. If the geometry isn't connected it will separate into different objects. You can try the boolean modifier again with the other alogrithm. Try offsetting the offsets by a tiny unnoticable value first.. $\endgroup$ – Leander Jan 7 at 16:30
  • $\begingroup$ They did separate. Did boolean with different solver (carve instead if Bmesh) and it worked ! Thank you very much :) $\endgroup$ – Filip Łazor Jan 7 at 16:52
  • $\begingroup$ Writing up the solution as a proper answer would be helpful if anyone else has this problem. $\endgroup$ – Sazerac Jan 7 at 23:25

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