Nozzle change disaster
A Cautionary Tale:
I received a new Obxidian nozzle for my CORE One earlier this week, since I plan to print some abrasive materials. This would be my first time swapping out nozzles, so I started by printing out the Nozzle Replacement Tool in PETG and it printed fine (other than that I forgot to swap out the smooth sheet for a satin one). The tool fit just right over the Nextruder sock and I even had a little 7mm ratchet. I loosened the thumb wheels. That was the last thing that went well.
When trying to loosen the stock nozzle, it wouldn't budge and the heaterblock started to rotate with in the silicone sock. Adjusted my grip and...managed to break the fan shroud. At this point, I decided to call it a day. I ordered some (non-Prusa) PC-CF so that I can print a new fan shroud. And I already have the Obxidian nozzle, right?
Today, I used a pair of soft-grip pliers to hold the heaterblock and remove the stock nozzle. Then I go to install the Obxidian. It's a little tight, but I'm able to get it most of the way into the heaterblock but it just won't screw all the way in (maybe 3mm left). I decide to back it out which is when the worst part happened: the nozzle sheared off and most of the threaded bit is in the heaterblock!
So now I need to order:
- a new fan shroud (and a spare)
- a new heaterblock
- a new (expensive) Obxidian nozzle
- plus shipping. 🙁
Lessons learned:
- The fan shrouds can be delicate
- Don't force things. If you have to force it you're probably doing it wrong.
RE: Nozzle change disaster
Prusa nozzle design leaves much to be desired. Seems like they try to avoid the Revo license fee resulting in a more complicated procedure.
RE: Nozzle change disaster
I printed the Prusa Nozzle tool in PLA (non-sock version) - I figured I would only be replacing the nozzle when it was cold anyways, so made no difference which material I used. I also remove the sock prior to changing, as I didn't want the squish from the silicon sock to get in the way of how the tool held onto the heaterblock.
It worked perfectly for me. Placed the tool into position, used a small socket and wrench to remove the old nozzle, and then inserted the ObXidion and tightened down. No issues at all.
Sounds like you had a really bad day with yours! If you are getting new parts I would now install the new nozzle into the heater block before installing onto the extruder assembly of course.....