Mudcrab 150mm measuring gauge ruler for Australia

I use this to measure the male mud crabs that need to be 150mm across head in Queensland Australia to be a legal take.  Please allow for shrinkage of filament in the printer or in the sun. I'd suggest a 105% print might be a good buffer for mudcrabs. And remember to only take the legal males and not the females (illegal). Please check your local rules and regulation  before using as they vary state to state (and by country). Enjoy ! Yum.