OK Folks, my apologies for not getting this out before Christmas Day, but I was, you know, Resolving Issues.
This is the solution for the late, forgetful, busy, or uninspired gift giver. Good ol' cash is always welcome, and this provides a cool way to present it and show off your 3D printing prowess.
The ellipse is sized to match the portrait on recent US currency. There is a slot at the bottom for sliding in a folded bill (or two or three), and an attachment point at the top for a hanger hook.
This can be a challenging print due to the ellipse which requires bridging, and the high, narrow aspect ratio. It is probably advisable to rotate it so that the long side is aligned with the direction the bed moves...though I had successes and failures in both orientations.
Failures occurred when the tips of the incomplete ellipse warped upwards and contacted the moving printhead, knocking the thing over. Something is different in the latest Slic3r (0.5.7) such that this did not happen.
I used default settings on Slic3r, excepting 0.1 fill density, concentric infill and 235 C nozzle temp.
I used a Prusa with a bed heated to 90 C. Base material was PET tape lightly smeared with acetone-dissolved ABS. I used black ABS only because that is all I have on hand at the moment.
A utility or hobby knife is recommended to clean up the bridged area of the ellipse.