3Dman Filament Welder Connector, Broken Filament Connector Sensor for 1.75mm Filament 3D Printers, Red

Trim the two filament heads that need to be connected.

One end pass-through from the direction of the big end of the filament welder to the tick mark.

The other end pass-through from the direction of the small head to the exposed 1-2mm.

Burn with fire for 5-7 seconds.

Then quickly push the filament from the small end into the small hole at the big end, slowly (must not be fast).

Then slowly pull back when the joint is exposed, back and forth several times.

After the filament is completely cooled, the filament is completely pushed out from the small head end until it can be easily trimmed.