Hi,
I’ve really liked the Flow dynamics calibration feature and it seems it works fine for 0.2mm presets.
K = 0.02 looks the best.
At the same time, I’m getting some issues while trying to print with 0.3mm layer height (0.28 preset).
I was able to find the proper value in the 0.01 - 0.015 range on my test models, but just wondering if it’s possible to run the manual calibration for layer height different than 0.2?
The K Value is materials based, the nozzle diameter matters most not the layer height
Thank you, understood, the problems are probably just more noticeable while using 0.3mm layer height since the flow is changing “faster”.
Gotcha just needs some tweaking then, Run those calibrations then and I would defiantly play with the temperature settings too
I don’t know how their logarithm works. But layer height does matter, because it generally affects the printing speed and the volumetric flow. The optimal pressure advance settings for different flows varies!
I’d really like to know how they calculate it, and it would be awesome if you could do a flow calibration on the specific different speeds, layer heights etc that you use, and store the values to the filament. Having it adaptive would be best, if you are using adaptive layer height, I do believe it could matter quite a bit?
In a nutshell it goes like this >
The flow ratio defines how much filament is extruded based on the movement speed of the nozzle.
The k-factor is a correction factor.
It comes to shine when you have to go around sharp corners, reduce the speed quickly and also whenever wall loops are added.
In other environments it is called Pressure Advance, which is more fitting.
The melting chamber hold filament and during printing has a certain pressure.
The k-factor ensures the pressure, speed and all related filament factors match.
If you want to calibrate k-factors for other than the standard height you can try a simple single wall cube.
Place the seam in the centre of a wall and print it.
A too high k-factor creates a gap, a too low k-factor a blob on the seam.
I helps to disable the slowing down options for layer cooling and to ramp the part cooling fan to full - this way you can print those loops at the normal speed.
Why do this at the normal print speed for outer walls ??
As you guessed already the print speed affects the pressure in the melting chamber…
Going slower is usually not much of a problem but printing faster means those pressures change quickly.
You want the k-factor to work for the speeds you are most likely using where it matters.