A personalized green lantern mask. My contribution for Halloween 2011. There are numerous green lantern rings on here you can print to go along with the mask.

You need around 185 mm x 195 mm of print area to print this thing.
Edit the .scad file to set your layer height. Default is 0.375 and it sets the extrusion height to twice that so you get a nice thin mask with only two layers.
Print on a heated build platform.
While the plastic is still soft, mold to fit your face.
This might take a little practice to get right, and I needed a couple extra hands.

NOTICE!
Please be very careful while doing this! Wait until all the plastic has solidified before you do this. It should probably only be done with PLA since it doesn't need to be as hot to be soft.