Heating goes up, then to 195, then wait again to reach high before calibration
Hello,
strange thing is happening with my MKS3+ now. When I start a print, heating seems well. As soon as nozzle temperature reaches desired temp (any), the target drops to 195 and nozzle cools down. If I tune it up again, it falls once more after reaching the target to 195 before continuing. Then it pauses before calibration to reach the desired temperature and then calibrate and print just fine without any glitches even daylong prints - thus I doubt there is a hardware problem. Even if the temp is good at the beginning of calibration, the printer pauses for a second or two anyway with the notice of heating.
Firmware is all the time the same previous version to current.
I am not sure what changed, it started when I first printed with PlastyMladec's PETG profile, but it happens with all materials since then, so I would not point there.
Any thoughts?
My opinion may not be right, but regret having so bad and right one too often.My models are things you can't see on any shelve. I create things that don't exist and that should be the…
RE: Heating goes up, then to 195, then wait again to reach high before calibration
Just checked, it's in gcode. So it comes from slicer thus it is either result of using that PM PETG profile or some stupid setting mismatch done by try of slicer 2.4 - but I tried and even 2.4 does this nonsense.
104 S195 ;set extruder temp
M140 S87 ; set bed temp
M190 S87 ; wait for bed temp
M109 S195 ; wait for extruder temp
G28 W ; home all without mesh bed level
M104 S230 ; set extruder temp
M109 S230 ; wait for extruder temp
My opinion may not be right, but regret having so bad and right one too often.My models are things you can't see on any shelve. I create things that don't exist and that should be the…
RE: Heating goes up, then to 195, then wait again to reach high before calibration
Have a look at the G-code section of the Printer Settings (Note: you may need to be in Expert mode to see that - can’t remember and not at my computer right now).
The Start section is most likely where that temperature sequence is being defined.
I have customised the start G-code on my printer so that the bed warms to final temp and the nozzle to 160. I then do bed levelling and then heat the hot-end to final working temperature. Printing starts after that.
Cheers,
Tim
RE: Heating goes up, then to 195, then wait again to reach high before calibration
Just checked, it's in gcode. So it comes from slicer thus it is either result of using that PM PETG profile or some stupid setting mismatch done by try of slicer 2.4 - but I tried and even 2.4 does this nonsense.
104 S195 ;set extruder temp
M140 S87 ; set bed temp
M190 S87 ; wait for bed temp
M109 S195 ; wait for extruder temp
G28 W ; home all without mesh bed level
M104 S230 ; set extruder temp
M109 S230 ; wait for extruder temp
My opinion may not be right, but regret having so bad and right one too often.My models are things you can't see on any shelve. I create things that don't exist and that should be the…
RE: Heating goes up, then to 195, then wait again to reach high before calibration
Ok, yeah, found it, it was in custom Gcode section of the printer, it was edited. Now, how can this happen on its own? Slicer 2.4 seemed weird, but 2.3.3 worked for me all the time without any troubles of this kind.
I understand that when one is printing for effect with low temperatures, this could make some sense. But I am printing for durability, thus with higher temps, nozzle makes blobs and sometimes it even leads to failed prints. I have to clean the nozzle before calibration, but if all the plastic remains in until calibration and make blob during that, i cant do anything but pause print during 1st layer, clean the nozzle and resume.
I'd like to delete the double post, but it says time to delete expired. Weird...
My opinion may not be right, but regret having so bad and right one too often.My models are things you can't see on any shelve. I create things that don't exist and that should be the…
RE: Heating goes up, then to 195, then wait again to reach high before calibration
The partial heat temp is for no ooze bed levelling. Some of us were using the technique ages ago, Prusa incorporated it into the defaults for the mini when it was released with a 160 degree mid temp but they didn't touch the defaults for the Mk3 series. Maybe they have finally updated them for those too now in the latest config updates. And personally I wouldn't run my printers without it so its not 'nonsense'.
The point of the partial warmup is that it is warm enough to soften the filament on the nozzle so that it wont damage the bed when probing and cold enough that more filament doesn't ooze out and leave little spots at the probe points that will mess your prints up.
The only way the modification could get into your start gcode is for either prusa to push an update out for the defaults or for you to have loaded in a printer profile that also incorporated it and then save that profile and have the new saved version selected.
If you don't want any prusa pushed changes then you need to stop using the prusa profiles. Detach them from the system ones and save your own local copy. That way nothing Prusa pushes out later will be applied. Of course you also miss other potentially beneficial changes that way, but at least nothing is changing without you being aware.
Ps, the edit timer on the forum is VERY short, just a few minutes.
RE: Heating goes up, then to 195, then wait again to reach high before calibration
This would make sense if the temp went up after calibration. I would understand that. But this way as it was set, it disallowed cleaning before calibration and oozed during it. It's much better when it oozes all out while bed warms up, so one can clean it and its gone, one can leave the printer. I'd understand a way that calibration goes with lower nozzle temp and heated bed, then pull extruder up, rise the temp, ask for confirmation and start the print after. Without the ask, one would have to pause and clean. Other approach would be to get the nozzle to print height and warm it there, thus no oozing, no missing filament in starting line and so on - maybe I will try to enable this. And as I said, if you have supercool tuned material, print directly from drybox, store your filaments well and dry and don't push too much for durability and adhesion, even the procedure I was experiencing could make sense. But it does not when you have filaments from three different sources with slightly different temps, even transparent and nontransparent colors have diferencies from single vendors, pure is again a little different. Thus one would have to have dozen profiles for first layer materials.
If it was Prusa pushed, it would not have orange lock.
And BTW, some wood filled PLAs have print temp arount 170 and if it stays longer at 195 it simply burns the wood in nozzle blocking it, thus such temp as a default is dangerous. There is no safeguard in the gcode addition for that.
Bottom line, I'm glad it was a simple config glitch and not hw problem.
My opinion may not be right, but regret having so bad and right one too often.My models are things you can't see on any shelve. I create things that don't exist and that should be the…
RE:
In fact it is very similar to pause behavior, that lowers the nozzle temp, so it oozes after one clicks resume, so one has to watch it and keep the nozzle clean until print actually start. Thus I tune up to print temp, let it ooze during the pause, clean, click resume and print immediately after.
There is no good solution to this, it would need a movable lid on the nozzle that would close it whenever printing stops, but there is not much space for such idea there and accidental collision with durablack or ruby nozzle would be bad. Thus it would have to be made from PEEK or PEKK or similar high temp plastics and proly would bring more trouble than gains. But it would remove the necessity of the tower with MMU, there it could save a lot material - if it was also able to push everything away ofc.
My opinion may not be right, but regret having so bad and right one too often.My models are things you can't see on any shelve. I create things that don't exist and that should be the…