Skull piston cavity molds

The skull piston key chain (https://www.thingiverse.com/thing:2055033) is so cool I had to make one and try the cold casting method. I thought it would be easier to print the cavity for the silicone mold, than to make it by hand. I scaled it down to 66% to get a smaller version. I broke it at the base of the skull after about 3 hours. I would suggest scaling it back up. Anyway here are the cavity molds if you want to print them. If you want the piston itself please see the original maker, "skull