When assembling the hotend, how many turns for the nozzle?
Simple question: how many turns when installing a heatbreak and nozzle?
When reassembling, the first step is to screw in the nozzle, then back the nozzle out some certain number of turns. But how many?
- Matter hackers says 1/4 turn
- e3d-online.com says 1/4 to 1/2
- Prusa says one full turn, and here too!
So which is is?
I am using 0.40 mm nozzles mostly, but sometimes 0.60 or even 0.80.
For nozzle swaps, I always use a heavy crescent wrench to hold the heater block. I used a calibrated torque wrench and socket to tighten the nozzle.
(As I write this, something occurs to me. Maybe I should be using a non-click torque wrench, maybe digital or dial. I have always imagined the click briefly over tightens, then after the click it slightly un-tightens. Which could be the cause of my leaks, maybe?
Cheers, everyone!!!
Tom
RE: When assembling the hotend, how many turns for the nozzle?
Understand what the end goal is. You want to insure that the nozzle and the heat break come tightly into contact. When you're building the hot end you run the nozzle into the heat block all the way and then back it out 1/4 to 1/2 a turn to leave a gap between the nozzle shoulder and the heat block. Then you run in the heat break until it comes into contact with the nozzle. At this point you want it snug but not tight. So long as there is a visible gap between the shoulder of the nozzle and the heat block you're fine. To properly seat the nozzle you heat up the hot end to at least PLA temperature and then tighten the nozzle with a wrench. Some people use a torque wrench to reach the proper tightness. When you're done you should still have a visible gap between the nozzle shoulder and the heat block, if you don't you need to start over. You don't nee a large gap, just enough to guarantee that the nozzle and heat break are tightly butted together.
Cheers
-Bob
Prusa I3 Mk2 kit upgraded to Mk2.5s, Ender3 with many mods, Prusa Mini kit with Bondtech heat break, Prusa I3 Mk3s+ kit
RE: When assembling the hotend, how many turns for the nozzle?
You have a Prusa printer so why wouldn't you follow their recommendation?