Nextruder V6 Nozzle Adapter Failure
Just a heads up to those using the MK4 Nextruder V6 Nozzle adapter. I have had a recently purchased one come apart between the threaded heater block insert and the steel feeding tube (image below). The tube pressed out about 1/2 way through a 7 hour print. I was running on Input Shaper mode, and I guess it does not have crash detection which compounded the problem, pushing the separated heater block onto the X axis plastic/cooling fan, causing the heater block to melt into that structure.
Specifics: 0.25mm brass nozzle, PETG running at 235C. Failed after about 5 hours of printing. I can heat up the block and push the steel tube (cold) back in, which does not seem right.
RE: Nextruder V6 Nozzle Adapter Failure
That looks ugly...
Formerly known on this forum as @fuchsr -- https://foxrun3d.com/
RE: Nextruder V6 Nozzle Adapter Failure
this happens to me already twice, with 0.25mm E3d V6 nozzle
The first time when starting a PA-CF print at the first layer, the filament has pushed the brass part out of the tube (@285°C) It scratches doen the new PA steel sheet until it stops due to hotend cable issue. It also broke the thermistor and heater due to brocken cables.
Then claimed at Prusa and got the Adapter, Thermister, heater and heater block replaced (not the PA sheet)
Now I printed Prusament PC-CF in 275°C and the same happens with the new V6 Nozzle Adapter, the brass part was pushed off the tube broke heater cables and scrtched a powder coated steel sheet...
The brass part was absolutely clean pushed off the tube and could be easily pushed again onto the tube again.
I don´t know how it is manufactured, is the tube only pressed into the brass part but the hole was too big or was the brass part clamped onto the tube by using a hydraulic fitting press?
Because of the adapter was already broken I took it to an collegue who has a hydraulic workshop and we pressed the brass part again onto the tube.
Now the adapter does no longer be pushed of is still watertight. I tried it at 290°C with PA-CF and loading to nozzle a few times.
My Printables models including Nextruder improvements: https://www.printables.com/@ThorstenLach_1801966
RE: Nextruder V6 Nozzle Adapter Failure
Although I dont think it's related to the present issue, be very careful printing CF/GF filled filaments with a 0.25 nozzle. The risks of clog increase considerably. In fact, I believe that Prusa has no predefined profiles for 0.25 nozzles and most CF/GF filaments or TPU.
RE: Nextruder V6 Nozzle Adapter Failure
@artur5
why do you think it isn´t related to the present issue?
I never had issues with cf filled using 0.25mm nozzle and clogging, as long as filament detection and filament loading works as expected. Even using 0.15mm nozzle did never caused a clogging nozzle, to me that sounds more as myth...
Well, only the reason, that Prusa Slicer don´t have a preset for cf/gf filament using 0.25mm nozzle, doesn´t mean that it doesn´t work or causes into a defect nozzle adapter.
And I was wrong, in the first defective nozzle adapter it was PA natural not PA-CF
My Printables models including Nextruder improvements: https://www.printables.com/@ThorstenLach_1801966
RE:
No, I don't think that what I said about 0.25 nozzles and clogs is related to your present issue. That's surely because of the V6 adapter. Nevertheless, please take into account what I said in my first post. Myself I print Prusament PA-CF11 with a 0.4 nozzle and no problem but 0.25 is quite risky. The particles in the filaments you've been printing must be very small and consistent in size, so you had no issues, but not all filaments are like this. I'd be very cautious trying a new CF filament for the first time. Even 0.4 nozzles might be problematic with some of them, and definitively I advise against printing TPU with a 0.25 nozzle.
RE: Nextruder V6 Nozzle Adapter Failure
I ended up finding an alternative supplier to Prusa on Amazon with a swaged extruder tube, I believe the seller on Amazon is FYSETC. I am running a pair of these and have not had the extruder pushout issue since (about a year now). The Prusa design relying entirely on press-fit force is not sufficient for smaller nozzle diameters, too much pressure.