Extended brass nozzle, default 0.4 caliber
Clogs, wear caused by abrasives, or the need for a new nozzle of a different size
Tools and materials needed
1.5 Allen key
2.0 Allen key
socket tool
new nozzle
If there is any residual material in the nozzle, heat the hot end to melt the material.
Pay attention to the high temperature when replacing it to avoid burns.