I’ve been doing some testing when purging filament through the same nozzle (right one)
It seems that even with the Flushing Volumes set to 0, the printer still flushes filament.
As you can see, Bambu Studio gives me the expected amount of filament usage (which is 0g purged) but when printing the H2D ignores it and purges like the puge multiplier is set to 1.
Even if i adjust the multiplier to .1 or .2, it will still fully purge, ignoring the purge values.
Analysing the Gcode, shows less purging, though the “VG1 E” command seems to be commented.
I’m not fully understanding the gcode here, on the left is the “0 purge” and right “0.4 purge multiplier”
i’ve checked the experimental settings to retract before cut in bambu studio
which is probably liked to this “M620.11 S1 L0 I3 R10 D8 E-18 F523.843” which seems normal.
Did anyone try to change the purge volume and did it work when printing ?
This is obviously a test to isolate the issue, i’ve noticed this when printing other multicolor models.
I’m probably missing something here if anyone has a suggestion
I’m also having a lot of problems with the right nozzle pushing WAY too much filament, even with my flushing volume turned way down. Very curious to see any thoughts or solutions on this one.
I’ve opened a ticket to bambu support.
First guess on their side is that it might be a firmware bug as the printer does not care what purge multiplier is set.
I’m using a 0.4 nozzle, didn’t run any tests with other sizes
I can’t believe this is still an issue, it’s ridiculous. It happens with my 0.4 nozzles too; I’ve confirmed it doesn’t happen on my P1S. It’s clear the software has no idea; I had a large multicolor print that was supposed to be done at 7am today, it’s now estimated to be done at 1130am or later because it’s flushing far more than the slicer expects.
Im getting the excessive purges too, nowadays on both 0,2 and 0,4 nozzles. Been printing on 0,2mm ones abouth a month now, sort of recall that before that the 0,4mm nozzles did not purge this much.
Oh well, most new things, no matter who releases them, are not quite ready untill half a dozen patches are released…
I filed a ticket as well. Support tried telling me that Dynamic Flow Calibration was the issue, but disabling it changed nothing. They now have logs, a screen recording with flush set to 0 and Dynamic Flow disabled, a sample print file with the issue present, and a video of the printer flushing enough that the color was completely changed by the time the print resumed in the next color. So hopefully they’ll have what they need to fix the issue.
I haven’t done as much testing, but they also have the logs and told me they will review this.
Hopefully with all of these cases they’ll be able to find a solution
I don’t know if it is related but I am seeing that the H2D is purging to the purge tower after completing the layer as well as before. This is on a two material print with one material per nozzle. I get that it purges before the print to get temperature and pressures stabilised but really don’t understand why it is p[urging after it finished the layer.
hope it will be fixed
