Just curious what other people’s experience has been calibrating pressure advance on the H2D. (For anyone that doesn’t have theirs yet, the printer stores PA calibrations by hot end side, HF vs standard, and of course by diameter)
I was just running a few of these trying to gauge how accurate the automatic calibration is and a get a general feel for differences between each hotend, if any. I tested the same filament with manual and auto calibration, on the left and right hot end with standard and high flow.
My preliminary result has been that I get very similar numbers between left and right hotends and also between high flow and standard. The auto calibration has more variation, but generally stays in the ‘good zone’.
For this specific filament at least, copying a single result to the other hotend or to the high flow hot end of the same diameter would have have been fine and more precise than the auto calibration.
I don’t expect this to always be the case, and of course there are other variables such as temperature. I plan to play around with it a bit more as I have time. But as I said, I am curious if others have experimented much with these calibartions.
Why do you think the manual calibration is better? I did find it quite difficult since I could often not tell which version is better. So I personally would never want to do that manually, and I‘m glad the printer does this.
Does anybody know how the H2D does it? There are no more extrusion lines printed as with the X1C.
It has been a month since my H2D started to gove me big problems with under exstrusion. From max flow rate test to factor K values. It says the plate is dirty but it isn’t and fails.
A new filament that subextrudes a lot on the left nozzle, on the right it prints perfectly. I also changed nozzles.
On the contrary, a filament that used to be on the right and was fine, put on the left, printed well there as well.
So it doesn’t seem to be a filament problem.
I have already opened a ticket with Bambu assistance. For now, I do not reset the printer or BambuStudio to avoid compromising any useful data for analysis, but I do not understand anything anymore! There is also anything in the extruder gear since I took off just the first cover following their tutorials.
I honestly think the calibrations don’t work. If I calibrate the filament before printing, it prints much better than if I tell it not to and just use the k value I got from the calibrations. I think Bambu needs to work hard to improve the user experience of this h2d.
In general I do not like the quality of the H2D (looking at 3 machines, 1 is mine) compared to what I am used to with BBL (X1C and A1 minis).
So for 300 hours I have been struggling to get a good finish and what I can conclude so far is that the issue is with the flow ratio. I am not sure if it is not right in the slicer profile or if the machine is not capable of providing smooth flow but…
What I know is that if I do the automatic calibration and save it to the device and then start a print with “automatic flow calibration” OFF then the quality is better than if I put a roll and turn it ON.
Meaning: I do the calibration, save it and print with that one.
As for right and left nozzle - mine seem to give almost the same value (haven’t done that enough but for the few times i did). Like 0.001 of each other
