Cannot duplicate Donut

Question

I am doing this Blender Guru Tutorial "How To make a Donut". At about Blender Beginner Tutorial Part 3: Modifiers 03:20 minutes Blender Guru is making a duplicate of a selection (separate the donut).

I am trying to do the same but somehow I cannot make the duplicate. Here is my blend file: https://mega.nz/file/DzZEkR7A#B9xjV-H83w_UndL4AFaC6bWvsFH0sna4yAt30Kt93aY

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The part I need help with is that when I duplicate and try to separate, the donut splits in half, not like in Blender guru's video

Answer 1

You've duplicated several times the top of your original mesh, so now you have overlapping vertices. Also, you have separated the original top of the original mesh; now as you see the original torus is cut off.

To fix that, in Edit mode, select all and M > Merge by Distance in order to keep only one mesh. Back to Object mode, duplicate the top, keep one top selected, Shift-select the bottom object, and CtrlJ to join into one object. Switch to Edit mode, move the top part towards the bottom part with some G and X, Y, Z until it matches the bottom part. Then select all and M > Merge by Distance to merge the top and bottom vertices.

Now you have a top that you'll use as icing, and you've rebuilt the bottom part.

Answer 2

I went through your file. You have duplicated the top part of the cube wayyy too many times, but since it in the edit mode you might have not understood it. So probably don't do anything with that right now.

Now I don't know that video, but to only seperate the upper part, you first need to duplicate it using Shift+D and then right after that, without doing anything else, click P and choose Selection. This will seperate the duplicated mesh.

Just in case you plan to not make the entire original mesh once again, this is what to do.

So first thing first you are going to have to clean up this duplicated mess. Click on one the vertices. Now click Ctrl+L. This will select all linked vertices and now click Ctrl+I to invert the selection. Finally click X and select vertices from the options.

Now go to object mode and position it back to where it roughly was. Try to be precise as this will help. Now joint the two meshes using Ctrl+J. Now go to edit mode click M and select merge by distance.

Now to seperate, select the upper part, click Shift+D to duplicate and then right after that, without doing anything else, click P and choose Selection. This will seperate the duplicated mesh.

I would suggest you to do the entire thing once again from scratch, as since you are a beginner you might mess up with the joining if the merge by distance doesn't work correctly.

Answer 3

To duplicate the Donut object:

1. Select the Donut
2. Press Shift+D
3. Move the mouse

Watched the video; he did the duplication of only one half of the donut.

If you want to do the same:

1. Select the Donut
2. Press Tab to get into Edit Mode
3. Press 1 at the Numpad to adjust the View
4. Press Alt+Z to toggle X-Ray
5. Box select half of the donut
6. Shift+D to duplicate
7. Move the mouse to replace, or Right Click to preserve location of the duplicate