Repairing bent nozzles
I did get my XL at the end of 2024 and because I print a lot of carbon fibre and pla-cu I got 5 obxidian nozzles with the printer. From the start one of these nozzles failed the calibration so in one head I did put an original nozzle. Now I have been printing a lot of pla-cu (colorfab copperfill) and had underextrusion problems. So I contacted tech support to see if they could help. The end advice was to dry the filament better and increase the print temperature. I did and that resulted in a nozzle that I could not get clean anymore. The solution for me was to print straight out of the Sunlu s4 and park it in a 90 degree angle at the back and remove the filament sensor from the path to remove the extra friction. But now I had two expensive nozzles that did not work. So I spend a day to figure out how to repair the bent nozzle.
The setup:
I take a vice and put the heater block in there. Then I take a measure clock like this one, with a needle on the end. I put the magnet on the flat piece behind the vice jaws and adjust everything so the needle rests on the copper bus end.
Now I take an unbent nozzle and put it in the heater block. I adjust the reading to 0. Now I take the bent nozzle and put it in and push/pull on the end of the nozzle until the reading is 0. The I repeat for the other direction.
Measuring the amount of bending 
and the bend in the other direction also 
the setup. The needle position is displayed in 0.01mm increments
After repairing my bent nozzle I did the calibration and also an other Obxidian nozzle was out of alignment. And I did hardly use that nozzle at all and I can not remember this nozzle running into any thing. Did any of you run into calibration problems with the Obxidian nozzles?
RE: Repairing bent nozzles
somehow the pictures did not get published:
RE: Repairing bent nozzles
. I did and that resulted in a nozzle that I could not get clean anymore.
Not sure what that means? If you take it out and use a heat gun, you can't get the gunk off?
Re bent nozzle. I run Obxidian nozzles in all my printers and have seen a bent nozzle only once, when apparently I was a bit over zealous in tightening the screws that hold it in the extruder. Which is really the only explanation I can up with for a bend.
Frankly, yes, they are expensive but I'd just go ahead take the loss and order a new one. This pushing and pulling the nozzle stem doesn't give me a warm and fuzzy feeling.
Formerly known on this forum as @fuchsr -- https://foxrun3d.com/
RE: Repairing bent nozzles
The gunk seems to be in the inside. I used cleaning filament on it and flushed large portions of it throug the extruder. Then tried an other print, wich failed, then cleaned again. I tried that two times and gave up. I can try to put it in a flask with ethyl ethanoate to disolve the pla inside, beacuse flushing with cleaning filament sometimes gives discolerations indicating that there is still filament inside.