What do I learn in this video?

I learn how to safely and cleanly refill the wallPen’s ink bags without spilling ink or trapping air.

Why is this step important?

Proper refilling ensures consistent print quality, protects printer components, and prevents unnecessary downtime.

What should I remember?

Only fill to the extent that your hand fits between the bags, wear protective gloves, open caps carefully, and never overtighten them.