Amazing, I gotta make one. 😁👍

3:20 - I had buy different two sets at Aliexpress with the name "Heat Set Insert Tips" for this standard Chinese soldering iron. One set for 2,19€ (there is one inset for the soldering iron and five little inlets for the melting tip) the other with five solder-iron inlets and each of them had an other diameter for m2, m3 m4 m5 m6 diameter. Right now I am printing a inlet for my Stem drilling machine, so that I can press the soldering iron straight down into the plastic.