I have this little plastic piece, how can i make a copy in metal

i'm having trouble with the mold
here is a 3d model of the piece
http://images4.sw-cdn.net/3dviewer?model=3441527

>>938128
print/shape with foamboard and use lost foam casting. dip in plaster of paris a few times for a smooth edge.

>>938187
oh tank you, i'll try that

>>938277
don't forget the sprue. and by smooth edge i mean smoother than sand will generally give you. you'll need to file with a needle file to get it to match exactly.
and you'll need to use pla and not abs. it needs something that will quickly evaporate instead of just melting.

>>938128
No idea why you'd go to the trouble of casting when you could machine it?

Fuck, I could make that with a grinder and a drill press out of steel bar.