Shouldn’t the nozzle size play a role in the flushing volume? I notice when I’m using the .2 nozzle, with the stock flushing volumes, the “poop” ends up getting so high it interferes with the nozzle, sometimes causing it to go places other than the poop shoot. Im adjusting the volume down to about 50% on the next print to see if it helps without bleeding. I use the prime tower so I made the volume of it a bit higher to compensate. But my guess is with a smaller nozzle you would need less volume to flush and a bigger nozzle would need more. So the software should adjust those numbers based on the nozzle size.
I don’t think it needs to do that. The volume is based on diameter of the filament times extrusion length. I don’t see that a larger nozzle should need more or less purge. I will say that the default purge volumes are conservatively high, and many people set the multiplier to 0.5 or even less. You should at least click the Auto button in the purge volumes dialog once you have set the filament colors.
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I see this topic has been around a while… but the issue seems similar. I am using a 0.2 nozzle on my A1 for some Lithos and noted that a 1.0 setting was probably too high was I am seeing behavior similar to Droopy where the ‘poop’ gets close to the nozzle and there is a fear of clogging as I see it.
I have not tried a lower setting yet, though I think I am going with .45 or .5 for the next print, though the white numbers in comparison the other CYMK spools are around 300 for a couple colors, and even that seems high, as I seemed to have an issue with the amount of white coming out during a purge, I’ve also disabled Auto Calculate in settings, not real sure whether thats a good or bad idea.
The smaller nozzle’s output, I would think would need less purge as the filament volume in the nozzle to purge would be less because of the smaller size, or am I looking at this wrong?
Any thoughts or feedback would be appreciated Thanks
I think there will only be a very marginal difference between the amount of flush volume needed for smaller nozzle sizes as most of the internal size of the nozzle between filament cut off point and tip of the nozzle will be the same size - it will just be a little bit at the end of the nozzle that is thinner.
In terms of pile up of flush - it think it will certainly be taller for smaller nozzle sizes - as the width of each stand will be less - so more turns will be required to achieve the same volume.
I think you could probably reduce the multiplier - but if you do need to flush a large amount then it might be worth looking at the enhanced filament change gcode developed by @AMT_MW here - as it has a feature to separate large flush pile ups into separate parts chunks. - see this thread Multiple poops with high flush volume please - #45 by Cenwulf
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I have heard of the enhanced g-code, may have to look into it… I am running a litho today and while the amount of filament purged is less with the new settings, still having random issues on color swaps, where it seems to stick to the nozzle because of how high it piles because of the smaller nozzle diameter. This has lead to, on one swap, the nozzle dragged a chunk to the plate, fortunately was able to grab it before it caused a problem.
So I either need to continue to monitor each change, reduce the amount of poop per swap even more, see if that helps, or hope that the g-code change really solves the problem. thanks for that feedback…