This is a clamshell bra sized for an average woman. If the girl is extra busty, congratulations! Oh, I meant you can scale it appropriately.
Printer Brand:
Robo 3D
Printer:
Rafts:
Yes
Supports:
Yes
Resolution:
Fast
Infill:
15%
Other things you'll need..
You will also need 2 x 12 inch long .25 inch wide elastic straps and 1 x 48 inches long .5 inch wide elastic strap.
Please see the picture for tips on using the buckles to attach the ends of the straps together and adjust the lengths as needed using the buckles..