Here is a very simple and cheap alternative for Romulan ridges prosthetic. Printed in skin colour NinjaFlex and glued using spirit gum glue.
I've just added a mold for Romulan ridges (two different sizes). I used liquid latex after printing mold and it came out quite good in combination with spirit gum glue. Any feedback will be appreciated, because I've only just started to experiment with molds and latex technique.
I'm a geeky physicist and I'm obsessed with 3D printing and 3D design :D