Use the filament connector to widen the holes of the two nozzles to 1.75 mm.

Insert one consumable at each end so that about 3–5 mm of the consumable protrudes slightly from the nozzle. I chose a compact heat gun because it can be placed upright. All you need to do is briefly heat and melt the two nozzle tips, then align and tighten the two fixing brackets. After it cools, voilà—the two nozzles are successfully connected! The two protrusions formed at the connection point can be easily removed with a slight nudge. I chose two nozzles and expanded the aperture to 1.75 mm, then fixed the