This is a tooling and nozzle holder for 3D printer. This should all the tools needed to do a nozzle change. The nozzle diameters are 0.2, 0.3, 0.4, 0.5, 0.6, and 0.8. This can be printed at 15% infill. For finer detail use a nozzle of 0.4 or smaller. This was made for PLA.