This Thing is a coral frag plug that is used when propagating (i.e. "fragging") coral in the saltwater aquarium hobby. Coral fragments are either cut or broken off of the mother colony and then glued to this frag plug using cyanoacrylate gel (superglue). The resulting fragged coral plug is mounted into 14mm eggcrate that is submerged in the saltwater aquarium where it is left until it is either traded with another hobbyist or sold at a frag swap.I have uploaded four variations on a concept that I have been toying with for what might be useful to a coral farmer. I am keenly interested in optimizing this concept so that it Works for those needing a good, quality, multi-purpose coral frag plug so please leave comments on how I might improve this Thing.Additional fragging tools that might be of interest:If you see other tools of interest, please let me know in the comments and I'll add links to them here.This particular thing is a mashup of the Pin Connectors V2 by tbuser (http://www.thingiverse.com/thing:10541) and the Knurled Surface Finishing Library by aubenc (http://www.thingiverse.com/thing:9095).When I saw the Pin Connectors, I knew I wanted to model a coral frag plug using it at some point as it should be (relatively) easy to make something that would fit and snap lightly into a 14mm eggcrate hole. The Knurled Surface Finishing Library gives the top of the frag plug a nice surface finish for easy gripping in a wet environment.I have currently uploaded four concepts (along with printing plates for each):The current features of these frag plugs are:Print with 100% infill using either ABS or PLA.Please, if you use this, leave feedback on how I can improve the design! :)