I need help with merging and stacking

[Weyrman_Albie]

I need words of wisdom and instruction.

I am trying to create, basically, a poker chip with different designs on each side.

I created the artwork for the 2 faces and then used MakerLab - Image to Keychain and downloaded them as 3mf. Each model has 1mm of coloured design and a 1mm black backing.

I opened 1, copied it and then opened the other and inserted the first one onto the plate.

Now I want to stack one on the other and this is where the issues begin.

I select the 2 models and merge them into 1

I choose Assembly and select the 2 bottom faces.

This causes only the 1mm bottom backing plate (where the movable face is) to move, leaving the 1mm design sitting there.

The orphaned design now won’t select as a single item and I can’t select the (now) bottom of the backing plate that moved.

How do I get each 3mf object to be a single “lump” so I can merge the 2 together?

I have read the wiki which basically says merge them then stack them and not much else.

[JonRaymond]

Are you able to upload the .3mf that you are using?

[Neiljt]

Can you center both objects seperatley before merging them ? (object mode)

Center / merge / move, treating each object as a seperate part(object)/ assembly / boolean

[Weyrman_Albie]

EB Coin Test.3mf (1.9 MB)

Here are the 2 coin faces as downloaded from Keychain Maker.

[JonRaymond]

First I flipped the right coin over.

Then Centered each coin.

Select each coin from the “Object” menu and Merge them.

You will need to delete the black bottom of the top coin.

The coin will now slice correctly with top and bottom as shown in the images below.

EB Coin Test - Modified.3mf (1.9 MB)

[Weyrman_Albie]

Thank you!
It seems that what I wanted to do is not possible. Thanks for the workaround, I’ll certainly keep it in mind if there is a next time.
I never would have thought of doing it like that.
Even if I got part way there I would have assumed that it failed as you can’t see that it’s worked until you slice it.