Well, I think that's the easy part. When you edit a component, there's a dialog box entry that you can specify the name of the 3D file. That I can do.
The problem is how to create a new component in the first place. Do you start by editing an existing component and then give the modified version a new name somehow? And how does it get added to the user components library. That would be good enough for now. It doesn't seem immediately obvious to me.
Oh wait! I just now noticed that your question was a link. Thanks!
Don't know if you have mastered this part yet (I have not), but here is another post that I am determined to completely and thoroughly struggle through one of these days until I get it working and understand it all. Setting up libraries: a mini-guide.
Possibly lots of good info here even if you have already set everything up.
I normally start a new component in the component editor. If there is a "similar" component, I start there. Many times, the component is the same as an existing one, but the pattern is different. I save the component in my user component library, giving it a new name. I draw a new pattern or modify an existing one. I then save it in my user pattern library, then add it to the component previously created.
Once that is done, you can then attach the 3D drawing to the new pattern you have, correcting it's size and orientation before you save the pattern again.
Oh man! DipTrace has more dialog boxes than you can shake a stick at.
Really, I'm a pretty good programmer. Just not so good as a program user.
You're probably one of those guys that sticks a bunch of those dialog boxes in, it's just poetic justice that you have to deal with them now! 
I am hoist by my own petard.
Busted!
Hey guys - can you point me to the components or libraries for the 5.08” screw terminals? I think I created some years ago, but don’t have those files any more.
thanks!
Was it this one from GRJ's earlier post? I haven't gotten this mastered yet. Further down in this thread it looks like Leo was getting somewhere with it. GRJ also posted a viewer at the end of the first page of this thread, here - From GRJ, STP Viewer.
I've got a bunch of the 2 and 3 pin screw terminals that I plan to use; from Asia. But the ones GRJ used for his design were Euro style. So I just went with a connector that has the proper spacing for the holes on the circuit board without a 3D model. I keep searching but have come up with nothing to match what I have.
What do your connectors look like? If they're standard terminals, there are 3D models in the DipTrace 3D library. They don't have the Euro style, which is why I had to go find some.
GRJ: I've looked through many of the 3D images in the libraries but only come up with pin type connectors. Here are pictures of what I have.
Where the wires go in to the pins on the connectors is 0.2 inches; one hole is skipped on the perf-board. I just now noticed that the blue are different from the green. Still the same basic footprint.
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I've attached the STEP files for the 2-pin 5mm and the six pin 5mm euro style connectors. You can also scale these to use on the .1" spacing euro connectors.
Here's the six pin used on the TMCC Buffer.
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Thanks John. On closer inspection, I don't see any difference in the models that you've sent. I'll have to play with these a little and see if I can't create the right components. 
Thanks guys - I didn't have the connectors in hand when I was making the PCB, so I waited until I ordered some from Mouser (26 cents apiece for 10, not bad) and downloaded a .step file from the manufacturer's site. Had to nudge and rotate the 3d model in place in Diptrace, but that was easy.
Just a simple 555 blinker for lamps; made it with a triac just for fun.
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