simple blood type MOLLE patches

Simple patch model to indicate your blood type, includes both 0 and O variants for lols. It is strongly recommended to use only the one matching your blood type.

At least Prusaslicer suggests to change the color at the appropriate height.

Seems to work fine with PLA, PETG might be better in the longer run.

I suggest using at least 4 perimeters to give extra strength to the clips at the side.

Obviously not for actual combat environments.