This filament welder I made from unused 3D printer parts.
I used
(1) E3D V6 Extruder with Bore 4.1mm Throat and 3010 Fan.
(2) PTFE Tube (OD4mm ID1.9mm L80mm)
(3) MKS GENL with TFT32 and 12V power supply.
You can download STL file of filament welder from
https://www.thingiverse.com/thing:4808983
