Dollhouse Double-Hung Window, 3' x 4', Scale 1:12, Movable Sashes

You can print sashes that provide 1 over 1 or 4 over 1 dollhouse windows.  The flat springs on the sides of the sashes keep them in place after movement.  I successfully printed everything without support. 

Install each sash by placing one side in the frame slot and then flexing the other side of the frame outward, allowing the sash in the other side.

Let me know in the comments if you would like a similar window for 1:16-scale dollhouses.