Same thing happened to me.
In 2010-2011 I spent a small fortune experimenting with movable parts in Stainless Steel!
By the time I decided I'm really "The Master"
, they changed the policy and,
now, all my models with moving parts that were successfully printed in the past, get rejected!!
Needless to say how p*&&#@ off am I!
I gave away the bracelet with tram that was printed in one piece.
I can't tell you the status of that one, because I never heard from the lady :cry:
When I wanted to order another one for myself, it got rejected.
So, in this instance I got around it by separating them in the same file,
and using a Gold plated Split "O" Ring (see link below) to assemble.
http://www.firemountaingems.com/search/?Keywords=gold+plated +jump+rings