The F410 default nozzle diameter is 0.4mm. If you have special needs that may require a different nozzle diameter, we do offer an additional 0.6mm nozzle print head and .8mm nozzle print head for purchase. The smaller the nozzle on the print head, the greater the detail, resolution, surface finish, and quality of the finished print. However, using the larger nozzles will significantly help cut down on print time.