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They do use the same origin.
I think that the data inside your spacer mechanical model is not at 0,0 but offset from that by some considerable distance.
If you enter 0,0 for the x,y values in the mechanical model properties dialog, if the spacer is not over the top of the pink 3D origin symbol then its your spacer that needs modifying.
I wouldn’t use the word ‘mangled’, that implies somehow that it is corrupted. I would prefer to say that whoever created it decided not to put the center of the spacer at 0,0 (Probably for some very valid reason) but if you want a spacer that can be used multiple times in multiple designs then you probably want the oorigin of the spacer to be in its center.
If you dont have access to an MCAD system then there’s not much you can do about it apart from look for another one on Content Central (or somewhere).
For MCAD/ECAD to work, I realize that the origin of 2 systems have to be perfectly matched.
Where do you put your origin so 2D match 3D's ? for a spacer, 0,0 can be at the center of the hole, but for any regular part like BGA or any IC ?
you have to differentiate between a model that is linked to a part and a mechanical part that is added to the design.
In my case, the spacer was an added mechanical part that was not part of the board, but I needed to add to then add another board as an added geometry to build a mechanical assembly and check some mating.
For this, I found out, that is important to have the 0/0/0 point such that you can place the mechanical part anywhere on your board, by using the same coordinates that the board uses.
In the case of a component, like IC, FPGA, resitor, transistor, trafo, and so on, that is placed on the board, and is part of the BOM, every part number can have a geometry model linked to it.
For this there is a procedure of mating and putting the surface together that allows to reposition the geometry regardless of the origin of the coordinate system of the model. Once this relationship is established, you use the origin of the cell as it is described in 2D, aka like you place this component in layout.
Hope this helps
If I might try to add to Matija’s excellent response:
if you use the optional 3D model library, M3DL, then there are a couple of commands in the toolbox that you can use to search for component models and have them automatically aligned to your component footprints.
If if you manually import a component model (from somewhere like 3D content central) there are a couple of commands you can use to simplify the job of aligning it to the components footprint.
In in either case, once you are happy with the alignment, you can push the mapping of 3D model to part into the central library so that it can be reused in subsequent designs.
Thanks Matja and Ed for clarification.