In the middle of a LARGE print and running low on filament on the spool. Had a couple of 3 to 4 meter pieces off previous spools.
Thought i’d try joining the short pieces together so I don’t run out (hopefully, this piece is 33 hours into it so far, still have 25 mm of height to go). Using a 200 watt soldering iron and the flat plate tip for the iron, I heated the ends and held them together until the joint cooled. Works! Had to file the squash off so that the diameter is close enough to go through the head. Using 3 mm ABS and happy so far with the weld!