Look the parts involved, in the pictures below: (I just noticed the one on the right is upside down....the middle part is also medium like the 9mm.)
First, there's the die itself....two parts, and you can print them in a set or one at a time. So....you simply pick a caliber. That's the easy part.
Then, there's the adapter.....that's the simple-looking cylinder...it comes in 3 sizes small medium large. That's dependent on caliber too, 3 sizes fit all. See the picture below and you can get a feel for what's going to work. 9mm works with medium..... .45 works with larrge......small works with smaller rifle bullets Where the part fits in? One end just drops over the feeder die.....the top end twist-locks over a spring adapter.
Finally there's the spring adapters....long one (on the left) goes into the drop tube out of the collator....the short one goes into that small-medum-large part. Springtube goes between them. You'll notice they are numbered. The larger the number the bigger the spring that screws into it. Study the picture below and you maybe can see what sizes might work for your spring. (I printed all three so I could fit springs that work.)
Notice #14 spring connector on the left.....it doesn't go into the cylinder's twist lock.....that's another part for clear tubing. As you can see this takes a little study, you don't just print a feeder die by itself.
Next picture shows that left part with the top spring connector that twist-locks into a collator downtube.
NOW, I can explain how you get the parts. Yes it's in Castboolits special projects, but if you don't know where to look.....well....
This is TylerR's project, and the "downloads" are at the bottom of any of his posts. So start by going to the longer than Hades thread, the closer to the end the better, because this was a long work in process, and the final stuff is in the last 25 pages or so.
Just start here:
https://castboolits.gunloads.com/sh...let-Collator&p=5361860&viewfull=1#post5361860 Then click on "downloads" then click on the green colored "code" and you download the whole project in a Zip file. Then look at the manual first. My pictures will help you find the right parts. You will go to "feeder dies" and you will also go to "adapters". Hope your friend is important to you, because this will take just a little bit of effort!
Keep in mind that the Dillon's springtubes will mate up with it's own collator, so depending on whether you print a collator or buy the Dillon, you will have to figure out how to connect things. (Nevermind that, don't think Dillon does bullet feeders...doh.) The twist lock is a TylerR thing. There WILL be more questions....
I'll turn my P.M. back on. Scratching my head....P.M. was on. Try again.
NOW, I'm going to shut up in this thread. Sorry to use up so much band width here. Repenting. Sorry O.P.