I leave mine over the broomstick just until they start to firm up, then I take them off and stand them on their side to dry. Make sure you aren't rolling too thin. This way always works for me. I've used premade fondant and MMF.
I just did the same thing when I made this huge bow for a 10" square cake. I made the loops (I used Wilton's fondant roller with the rings to get them perfect height - 1/16"?) and hung them on a broomstick for about 15-20 minutes. Then I put them on their sides on the counter to finish drying. I also flipped them once or twice and fussed over the shape a bit before they totally hardened. The bow looked really nice, but it needed about 16 loops and could have used more. I "glued" the loops together with some royal. I wish I had tinted the royal the color of the bow though so it would have been less noticable.
Good Luck!
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