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I'm building a submarine for 3d printing and I have a removable top lid that I want to remove from the model to machine separately. I do a SHIFT+D on my selected area and when I move it off and do a separate loose parts to make the objects independent, I get this weird staircase pattern on the back of my boat.

What is this and how do i fix it?

enter image description here

enter image description here

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Is this the result you're looking for?

Separate

If so, then, yes, the problem was duplicate vertices - 222 to be exact. Select the whole thing, go to Mesh> Clean up> Merge by distance. When I did this, I still noticed two stray edges bisecting planes near the back (second time I tried I found only one for some reason) - look for them, select them, right click and choose "dissolve edges".

After that, re-select the area you want to duplicate/separate, and it should work the way you intended.

Also, is there some special reason you're separating By Loose Parts, instead of by Selection? By selection is what I used without thinking, and I can guarantee it works (I tried both ways and they both work).

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  • $\begingroup$ Just tried it. Didn't work. I found another clue. If I go into edge select mode, and try to select a block of edges, it highlights the faces if the face is enclosed by the selected edges, except for these offenders. It captures the edges but not the faces. I'll paste a pic above. $\endgroup$
    – mj_
    Jun 24, 2020 at 2:32
  • $\begingroup$ Sounds like there might be some duplicates of something somewhere. Any chance you could post the .blend file? You can do it here - blend-exchange.giantcowfilms.com $\endgroup$ Jun 24, 2020 at 2:35
  • $\begingroup$ Blend file attached! $\endgroup$
    – mj_
    Jun 24, 2020 at 2:42
  • $\begingroup$ Ok, I edited my answer. have a look. $\endgroup$ Jun 24, 2020 at 2:56
  • $\begingroup$ Thank you! Thank you! Thank you! $\endgroup$
    – mj_
    Jun 24, 2020 at 15:31

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