Put Object On Top

I have a model that has no flat bottom. So I want to create a bottom. But I can’t seem to slide the object on top of the rectangular cube I added. The z-axis does not seem to work, to raise it and then slide it on top of the cube.

Ideas?

bottom.3mf (8.3 MB)

You need to select both parts, right click and “Merge” them. This will combine them into an assembly and allow you to move the part in 3d space as long as the other part stays on the bed.

GIF 2025-06-10 4-30-00 PM

Thank you for including the .3mf, unfortunately the forum is broken and it can’t be downloaded otherwise I would have demonstrated it with your part.

I am unable to select both objects so they can merged. Do they both have to fully on 1 plate to both be selected?

Select one, while holding “Ctrl” select the other. You can also select them from the left hand side tree as shown below.

GIF 2025-06-10 5-01-46 PM

Additionally:

Select All
You can also Cmd or (CTRL is Windows) + A to select everything.

Select some
You select all those in a region by holding down the Shift button and then drag a rectangle around the items you wish to encompass.

No.

Once they are merged, you just split them again into objects? (not sure where u clicked on after merging)

Apologies, but I am confused.

Your question stated you wished to create a bottom to an existing model.

Two people have shown you how to merge the two objects so you can place one on top of the other.

Why are you now asking how to split them?

If one object is the top part and the new object is the base, merging them allows you to place one on top of the other. Why do you wish to break them up if they are doing as you requested?

We cannot view your 3MF file because there is an issue with the forum. Does this provide more information about your goal?

If so, please share it using a different service like WeTransfer or any other that doesn’t charge you or us to view the resulting file.

I merged them. Then what? I try to move 1, but because they are merged, they both move together. How do u do that? I asked about splitting to as that icon for slip to objets gets greyed out after something is done. It’s not clear what was done. If I am still not making sense, I will try to post it somewhere.

Thanks

Thanks.

  • Move to the objects view.

    Screenshot 2025-06-11 at 01.13.30

  • Navigate to the plate and expand it.

  • Expand the merged group of parts

  • Select the part from the objects list you wish to move up

  • Use the toolbar move tool

  • Either enter a new Z or use the arrows to drag it upward.

Confusing definition of Merge, Group, Combine

Merge and combine mean the same thing in many contexts.

I didn’t use combine though.

I did use both merge and group, but not as two different definitions of the same thing, two words, used side by side to define one thing.

It is a group of parts which have been merged.

To whom?

Merge is the term used in Bambu Studio and it is a group of parts.

This would have made no sense.

Expand the merge.

English demands use of descriptive words, nouns, adjectives and verbs, they were provided.

  • Noun: group, parts
  • Adjective: merged
  • Verb: expand

I am not finger pointing at any1. If there was some1, it was B.S. confuse people.

In my vocabulary,

Merge almost equals combine, like merge 2 branches of a code into one, even though 2 branches are in different code styles from different coders but for the same function.

Combine is like appending one file to another file.

Group is like putting 2 files in the same folder.

I see a confused user here, should it be “group” instead or “merge”?

Anyway, I hit reply button that doesn’t mean I quote your reply, Malc. I can only blame the forum for this.

The forum is annoying that hitting reply at the bottom or reply to the last message appears as the same thing.

It is also confusing.

The wording in Bambu Studio is unfortunate, the convention in software is group as merge usually means something else as you noted.

I don’t think it helps that most people don’t notice the difference between the global and the object view.

There are many things that just fail any obviousness test.

I admit I was being a little defensive, there are a few here trying to attack me for their amusement. I should have known better given it was you, you have always been decent.

1 Like

This was confusing for me as well and ran into what I think is the same problem you are having.

Seems you got this far - select multiple objects by whatever method (ctrl click, shift drag a box around them), right click and select merge from the menu. This groups both items into an assembly and selects the entire assembly. Any actions you attempt will apply to this entire assembly, moving 1 part will movr all parts.

To enable you to stack them on each other you will need look in the left pane and make sure you are viewing Objects, not Global. You should see an assembly with the individual parts listed. Select just the part you want to move and choose Move (M) in the menu bar at the top. This will enable you to manipulate the Z axis position with it falling down to the level of the build plate.

Took me a while to figure this out, was stumped for ages as to why I could get things in the position I wanted and they just drop down after I moved them.