In principle, a normal thermal gun for its little money, if you rarely use it, it will live for a long time. If every day is a lot, then for a year or two (provided that the arms are straight to eliminate breakdowns). Some pros: Cheap, puts out a lot of glue. There is an adjustment. Reliable power cord. The stand, in principle, normally allows you to put a thermal gun. Repairable. Workhorse. Cons below: I noticed three problems with this thermal gun. First, the nose leaks on almost everyone. Constantly dripping hot glue, changing the spout is expensive, so you have to adapt. Secondly, the red wire to the control board is poorly soldered (it looks like a factory defect), because of this, the thermal gun stops heating. It is solved simply - to unwind and Pripyat back. Third - after prolonged use (more than a year, probably), it breaks the pen holder ring inside the feed mechanism. Decided to have to with the help of a steel plate and screws.
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