The test print didn't quite achieve what I was hoping, but that was because I printed it with 2 shells, ideally I should have printed it with 1 shell and mush faster to get the clear ABS to .. well, be clearer. It's late... I'll do a big full size head tomorrow (as in not halved) and will test it, if it goes well I will add it to this pack. This was a very quick print, around 80 minutes, but it was small, we'll go big tomorrow. I really want to see the skull through the clear. I used Red on the inside as I wanted a striking colour to come through the clear plastic, really anything that's contrasting, I probably wouldnt use yellow or white in there, it just won't look that great I don't imagine.