Got them today!
Been playing with them a bit. They do fit a standard butterfly clutch back, quite well actually, due to the somewhat rough texture. I would still be very careful with the posts however, because they are only 1mm diameter. They will pierce through material. I haven't yet taken photos of these on my Service C shirt yet, cause (don't laugh! haha) I can't push them through all the way, totally my own fault, damn these weak little muscles!! haha. I did get it to pierce through ever so slightly though. Will have to wait for someone else to do it for me haha, then I will take photos of them on the shirt.
Minor problem however, and again, not my fault and totally nothing wrong with the product. I may or may not be able to keep these pins

because I actually ordered 3 sets with 2 different branches, and they sent ALL U.A.C.M. pins. I checked the file that was attached to my receipt and it was indeed Shapeways fault. I am in the process of dealing with customer service. The funny thing is I asked for a photo of the finished product before they shipped it, and they said "we don't do that". But had they have sent me a photo, I would have caught the mistake! haha. I'm hoping that I get to keep these, and will get refunded, but it just seems too good to be true, sadly

We will see!
Next to standard "Military Butterfly Clutch backs" and a good ol' Canadian 25 cent piece!
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I will open a thread in the PX once the issues are resolved, which will hopefully be later today!!
