This is a spicer joint created in Solidworks for the Rostock Printer arms, but instead of printing one at a time, this file contains all 12 required pieces ganged up in one file. The benefit is that the layers have some time to cool down, which I think makes small holes print a bit cleaner. It's also nice to not have to print 12 individual joints!I found it easier to print this file containing all 12 required joints once instead of having to print the original 'joint.scad' 12 times. This is an updated version which is slightly larger overall for better fit to the original Rostock Jaw.