What do I learn in this video?

I learn how to properly purge the wallPen print head to remove air bubbles from the nozzles.

Why is this step important?

Purging prevents printing gaps and protects the nozzles from damage caused by trapped air.

What should I remember?

Let the print head warm up before purging, press only on the center of the ink bags, and never apply direct pressure to the nozzles.