After abort next print crashed nozzle into bed
I am trying to understand what I am missing or what might have been wrong in my scenario:
I was printing something and noticed that there was quite some amount of build up at one place much higher than the current layer so the nozzle would ran into it, I hit abort and the printer stopped. Now the nozzle was hot and stopped right in the build up. I then manually raised Z so I can clean it.
Removed the failed part and started preheating for PLA again.
Then I started the next print, now the location of the extruder was basically centered on XY and raised on Z quite high (so I could clean it).
The extruder moved to the right (I assume auto home) but did not finish, for whatever reason it decided it found it's home (it wasn't fully at X = 0 but was at Y = 0) and started the 9 point calibration.
The first point was not really home, the second point was close to the X end, when it tried to reach the third point it hit X end and then nose-dived fully into the spring steel bed leaving a noticable dent and remained in the bed. I aborted the print quickly.
Then I rushed through the menus to raise Z while the nozzle remained in contact with the bed. Currently I've done a full XYZ calibration and did not yet print the next one due to time limitation.
Can somebody spot obvious issues? I had two successful prints before, after those the printer was not moved, no filament changed, no sheet was replaced.
Is some sort of calibration needed when a print is aborted via the reset function?
Re: After abort next print crashed nozzle into bed
in such cases I use stop print from menu. No problem with that.
Re: After abort next print crashed nozzle into bed
in such cases I use stop print from menu. No problem with that.
Happened again. I stopped via the menu, no reset happened. Then pressed the knob so I could lift the extruder. Cleaned the nozzle.
Next run this thing rams again into X end and issues an XYZ leveling issue.
That's very irritating
Re: After abort next print crashed nozzle into bed
Since the printer prints from the bottom up, how is it possible that you had material higher than the nozzle? Was the print lifting off the bed?
Something odd that you mentioned was that the extruder moved right first when auto-homing, mine always goes fully to the left first. I'm thinking that might indicate that you have an axis binding so it thought it was already fully left?
Re: After abort next print crashed nozzle into bed
Since the printer prints from the bottom up, how is it possible that you had material higher than the nozzle? Was the print lifting off the bed?
Something odd that you mentioned was that the extruder moved right first when auto-homing, mine always goes fully to the left first. I'm thinking that might indicate that you have an axis binding so it thought it was already fully left?
Well, I noticed oozing when I preheat the printer for PLA, so there is a tiny string which I cannot grab because the extruder is too low. When the printer starts printing and prints its pressure stabilization line in front of me the oozed string is pressed against the nozzle, since it is hot, it sticks to it.
When it proceeds to print the outline, the now dirty nozzle catches on the very thin outline layer. Sometimes the adhesion to it is better than to the bed so it pulls it off and sometimes it manages to "wipe" the dirty nozzle off at some point on the print leaving a hardened piece of plastic much higher than the actual layers, when the nozzle would revisit this part it would hit this.
Re: After abort next print crashed nozzle into bed
Ah, ok! I long press the encoder knob and raise the Z axis to about 80mm before I preheat. Once I kick off a print, I wait like a vulture with a folded paper towel in hand, until the Z axis just begins to lower during the homing sequence. I give the nozzle a quick wipe to remove the ooze and then watch the bed while it reads the 9 points. Sometimes it leaves a little dot here or there on the bed so I clean that as it lays the intro line. Usually works fine!
Re: After abort next print crashed nozzle into bed
Coincidentally, I just came on here to ask what to do about my problem, and it's pretty much the same as yours.
I had a morning of failed first layers, after a successful day with no problems. Btw, my live adjust Z is *always* high, no matter how many times I recalibrate, moving the PINDA probe tiny amounts each time. Yesterday's Z was .877, which gave me pretty good results.
Today, that's wack.
It always needs adjusting, sometimes on a print by print basis, which is un-acceptable.
I read a lot of posts whereby people say that one must get used to making [n] adjustments, as this is not really a consumer product. You don't say...
However, I do accept that, but if anybody is prepared to explain why I need to start the day with 5 or 6 failed first layers, wasting material all the time, and watching a first layer for 20-30 minutes each time (for a decent sized print, and that's three hours of my time gone, which I cannot spare each and every day) before having to abort and adjust things again, then I'm all ears...
I lowered the Z incrementally, but had to use the 'stop print' function 6 times in a row. I lowered the Z from .877, in increments, to .922, before I could get consistent extrusions close enough to stick to each other, but then, once I had achieved that, the nozzle started scraping on parts of the print on the second layer, indicating it's now too low. These things are mutually exclusive. It's not possible to get both a 'just right' first layer, and a 'too low' second, unless somebody wants to educate me...
Each time I aborted the print, I used the 'stop print' function, never just switching off or pressing the reset button. Each successive print started with a 'no problem' calibration. Yes, I alway make sure the bed and nozzle are cleaned, before I hear one more person say the same old, same old thing...
Seventh attempted print, and after four calibration points, BANG! It slams the nozzle into the bed, then gives a non-committal error message about checking filament is not on the nozzle, which is basically just a get out.
I now have a ruined steel sheet (see picture), through absolutely no fault of my own. Ok, so I turn it over and use the other side. Until when? When it does this again, are Prusa going to accept the blame, or is it 'mysteriously' ALWAYS down to something the user has done? When it does this again, do I buy another steel sheet, and wait [n] weeks for it to arrive before I can use the machine again, and waste three hours each day setting it up over and over?
My advice is to NOT accept the 'it's your fault, it must be something you've done' blame game, whereby you then have to adjust an infinite number of variables in order to prevent something happening again, when it's not possible so to do.
Who is responsible for our ruined steel sheets, after we have followed all advice/instructions to the letter, and done nothing any different?
G
Re: After abort next print crashed nozzle into bed
@giulio.z Are you experiencing binding on X or Y axis?