If I’ve just printed something with PETG at 255°C, and I need to go back to PLA at 210°C, how does the CFS “know” that the previous material was PETG and doesn’t try and extrude it at 210°C?
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The settings for every reel you put in are either set by the RFID tag, if there is one, for Creality products OR you manually have to tell it what you have loaded in the CFS wells.
Select the pen icon below the reel within the printer dashboard / filament. You then set the broad details of type of filament.
Further detail are set/changed by selecting the appropriate reel in the CP program and again clicking on the pen icon to change multiple settings.
No, I get that…but assuming I have Clear PETG in slot one, extruding at 250°, and Tan PLA in slot two, extruding at just 210°. All data entered on the filaments tab correctly.
After printing with the PETG, surely there must be some PETG left in the lines or extruder after the model is finished (because if not, why do we have purge towers etc?).
If my next print is in the PLA, it only heats the extruder to 210°C. That will just turn the PETG into unprintable taffy, surely? Is the machine good enough to push out that “plug” of old, too cold PETG with the PLA that#'s coming up behind it?
That is an interesting observation. Funnily enough I have noticed that when a change of filament is signalled the extruder purges 3 times. twice otherwise.
After switching on printer :-
Currently I have PETG in on a 0.4 nozzle
Have changed to PLA-CF and extruded to test
The printer automatically purged the PETG at 250 deg three times
Then I extruded again. This time printer automatically extruded at 220 deg - twice
I did not set any temperatures etc
It knew I had changed filament
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I’m glad I found this thread as I was curious to know how the printer handles this. I tried to print on ASA for the first time last weekend, and the previously used filament was PLA from a few days earlier. Both set correctly in the CFS for their print temperatures.
I tried a new print and after some time was greeted with a message telling me that the extruder was potentially blocked trying to load the ASA. I retried it but kept failing. I then noticed that their was filament bubbling out of the filament but it wasn’t the usual flow.
I had to access the extruder and clear the blockage - the new ASA filament had managed to get into the top section of the nozzle but was now blocked further down. Using a heated tool I was able to grab the ASA filament to pull it out, which also brought out some PLA, then with a thinner tool checked everything was clear. The next attempt to load the ASA was fine and the print went well.
But now I wonder what will happen the next time as the ASA is still in the nozzle and I want to use PLA next. To me it seemed that the ASA load heated up the nozzle way above the normal for PLA and almost boiled it causing it to move slightly up the nozzle and then solidify blocking the ASA that was trying to come down.
@Taomyn
Interesting.
This would suggest that when going from PLA to very high filament a manual heating of the nozzle to purge (without filament loaded) is a probability to help clear the nozzle before loading the high temp filament
Or maybe we should keep different nozzles for higher temp filaments.
From what i have noticed the printer purges the remaining filament.
This can however be disrupted if you turn the printer off completely as i think the information of which was loaded before is not stored permanently.
This however is speculation.
My post from 6 days ago was after switching printer on to action my post. It clearly remembers previous filament.
Will amend post to confirm
I just watched the temps closely while swapping back to PLA after the ASA from a few days ago, and I saw the nozzle temp go to 260, performed some wipes, loaded the PLA, then purged out 3 times, and then lower to 220 and start with the printing. So far so good.
Oh, and this was after installing the latest firmware which was finally available through the screen.