This is where the actual printing happens. The nozzle carefully threads the plastic onto the glass layer by layer from bottom to the top. This is important to consider since some item designs require you to invert the item when the bottom part is more detailed than the one above. It’s a very meticulous process since the nozzle actually cleans its tip after doing every layer to ensure the most accurate product. Warning: This takes the boredom of watching paint dry to a whole different level. Better have something else to do while waiting.