After seeing photos of someone who burned up their fan shroud due to something being faulty during installation, I would like to suggest that you change your documentation a bit to the following: 1. Get the metal components assembled. 2. Attach the wiring. 3. Turn up the temp. 4. Validate temps. 5. Tighten parts as per spec. 6. Turn off everything and let cool. 7. Attach fan shroud. 8. Install on printer's effector. 9. Turn on host software to heat up hot end to 190C. 10. Check temps with a multimeter/temp probe or a heat gun.
Hey John, in step 5 I do not have the heat break attached to the cold end (aluminum ribs). I hold the hot end block in an adjustable wrench, position the heat break and nozzle to leave just a hair more than the required gap and then heat to 300°C and tighten the nozzle with a 7mm socket driver (the type that looks like a screwdriver with a handle). That way there is no strain on the heat break and no chance for it to break. Once cooled off, I install the hot end to the cold end. Your step steps are a really good idea, things can go bad quickly if there is a problem!
The Heat gun will not work to accurately measure hotend temperatures. Something called Reflectivety stops it from working properly. You need a thermocouple that can go inside the hotend to accurately measure its temperature.
