Velleman vertex k8400 3d printer kit velleman k8400 the vertex k8400 is the next generation of velleman 3d printer kits it is easy accurate affordable and has an open source architecture the 3d printer is dual head and heated bed capable it is supplied with one print nozzle a second optional nozzle can be fitted permitting two colour printingvideos building instructions and user manual are available on line at wwwvertex3dprintereu velleman vertex k8400 3d printer