My X1C suddenly prints terrible first layers, holes in 1st layer, any filament, build plate thoroughly cleaned with dawn, new rolls of filament. Fails to calibrate any filament, (always fails first layer)
dried in S4 dryer overnight, (BTW, same rolls of filament print perfectly in my P1S) ran machine calibration, reset to factory defaults and ran calibration again, wondering if SS nozzle needs changed? machine has 409 hours on the clock.
I’ve heard of a faulty hottend heating assembly being the issue.
I have well over a thousand hours on each of my printers and I have not needed to change the nozzle.
That doesn’t mean it isn’t your solution though.
Ideally you have a spare, if you don’t get one. One likely came in the box if you are ok getting a little messy or the complete hot end unit is available (my preference due to tremors).
If you have a spare swap it out and see if things change.
Your usage of certain filaments can cause wear and tear far earlier than if you only use PLA.
A hardened steel nozzle would be a great idea even if you only use PLA, it has a longer life expectancy.
BTW, you added this in the X series category, I was under the impression they come with a hardened steal nozzle as default.
When you’ve tried everything else and your prints still suck. 
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Thanks for the reply -
Yeah Malk, I thought that was really not going to be the case - 400 hours is nothing when I have been printing only PLA from Sunlu, It’s odd that the flow calibration fails every time -
BTW, my X1C came with the SS installed, and a hardened nozzle as a spare - I will try again, if all else fails, I’ll change the nozzle.
I don’t think it is a filament issue though, as all the filaments I tried printed perfectly in the P1S
I double-checked, the current printers are listed with Nozzle 0.4 mm Hardened Steel Included.
Found in the Tech Specs.
Have you swapped the build plates over between your P series and X series printers?
Maybe it is the build surface causing the issue.
Did you try a cold pull? You can have a partial blockage.
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Swap the build plates…Will try that now!
re: under maintenance screen, accessories, the screen now says 0.4 hardened nozzle as you state, but I also thought that the spare would be SS, but it is also hardened steel , so I am confused because before resetting to factory defaults, I am sure it said SS nozzle, so I guess the only way to see what it really is, I’m going to have to take it apart …
ANYWAY, I did not know that the build plates were interchangeable, because the X1C plate has different graphics on it in the center of the plate, and I thought that had something to do with the lidar or bed leveling?
The X series is the daddy, it comes with the best stuff, the P series comes with a stainless steel fitted nozzle and a stainless steel spare, but, you can’t buy a stainless steel replacement, someone drink that that up.
The build plates are interchangeable, the A1 (not mini), P and X all take the same plates. The only one with it own specific plate is the A1 mini.
There are different types of plate, but if they are not for the mini, you can swap as much as you like.
hmmmm - just discovered that the lidar calibration label is that little white tag on the right side of the build plate platform(not the removable PEI plate as I thought at first) The spare hot end comes with a replacement label, but it is the same pattern as the one on the printer…wonder why it came with the nozzle?
Pulled the cover off of the tool head with the idea of performing a cold pull or nozzle cleaning, or replacement of nozzle if that failed, and guess what? found broken wires on the part cooling fan - not been in there before, so don’t know why this happened, but can’t see any way to fix the wires, so I just ordered complete hardened hot end, to avoid any other possible issues, and still maintain a spare nozzle at least. Hope this resolves the issue!
Thanks to DeVerm about nozzle issues, and all the ideas from MalcI, never would have thought that could be the issue…
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