As I read some articles on extruder calibration I thought to have a look too.
I removed the tube and aligned my filament exactly to the top of the unit.
Using Repetier, I manually pushed 100mm of filament, cut it properly and then measure the length.
This is where I measured 134.5mm, not 100mm?
Shouldn’t this be very close to the 100mm I was asking for?
Erik
[quote=“h60”]As I read some articles on extruder calibration I thought to have a look too.
I removed the tube and aligned my filament exactly to the top of the unit.
Using Repetier, I manually pushed 100mm of filament, cut it properly and then measure the length.
This is where I measured 134.5mm, not 100mm?
Shouldn’t this be very close to the 100mm I was asking for?
Erik[/quote]
Hi Eric
I’ve noticed the same thing.
I’ve been looking in the Marlin codes and the DEFAULT_AXIS_STEPS_PER_UNIT for the extruder is set at 200.
But according to this calibration guide http://reprap.org/wiki/Triffid_Hunter%27s_Calibration_Guide (which is splendid, by the way) is should be around 150 - 170, correct?
Also, if you look into the filament tab in the Repetier Vertex, it is set at 90% under the extrusion amount ( Sorry if it’s called something else, I’m not at my workstation where the repetier is installed ) . So it seems Velleman chose to calibrate there instead of doing it through the firmware… Then again, I’m only guessing 
I’m also just guessing here, but I notice I have better prints by reducing the flow to 70-80 percent (just by trying).
If I calculate 100/134.5 the answer is 74% which is about the flow I’m using. Is that a coincidence?
[quote=“h60”]I’m also just guessing here, but I notice I have better prints by reducing the flow to 70-80 percent (just by trying).
If I calculate 100/134.5 the answer is 74% which is about the flow I’m using. Is that a coincidence?[/quote]
Maybe not, because I’m doing the same. I print at 80 percent to get better prints.
I think you might be on to something here.
I also get way better prints with a 70 to 80% setting.
So, after a couple of measurements and calculations I chose to alter the value in DEFAULT_AXIS_STEPS_PER_UNIT in the Marlin firmware, from 200 to 146.56.
I can now print at 100% flow and get really good results. The infill is also working up to 100% instead of filling the models completely at 60% before.
By the way, the value I got may differ for anyone else because of filament brand/type and setup
And please, I take no responsibility if anyone chose to change their own values. Do it at your own risk
What filament are you using?
With 70%-80% flow by layer 0.105mm I have a rough surface and holes/slots in the top and bottom surface …
-> Printed with original vellemann white pla, the white pla is much more difficult than orange for a good surface quality
…hmmm, bizzare why everybody is printing with reduced flow for better surfaces … are there other settings?
Mike
I print with original Velleman PLA. I did not (yet) change the esteps but reduced the flow to 74% and 1.73mm for filament diameter.
My layers are normally 0.2mm thickness.
I print with a minimal top/bottom thickness of 0.8 and if infill is used, I typically set that to 25-30%.
All my layers are very nice, including the top layer.
The only thing I noticed is that my first layer is now too thin, but 2nd or 3rd layer prints fantastic.
I believe 4 top/bottom layers (0.8mm) with 25% minimal infill will help making those nice and smooth.
Erik
[quote=“h60”]I print with original Velleman PLA. I did not (yet) change the esteps but reduced the flow to 74% and 1.73mm for filament diameter.
My layers are normally 0.2mm thickness.
I print with a minimal top/bottom thickness of 0.8 and if infill is used, I typically set that to 25-30%.
All my layers are very nice, including the top layer.
The only thing I noticed is that my first layer is now too thin, but 2nd or 3rd layer prints fantastic.
I believe 4 top/bottom layers (0.8mm) with 25% minimal infill will help making those nice and smooth.
Erik[/quote]
Try increasing first layer fill in Cura quality settings! I have to go first layer with 125% to get adequate fill. Filament flow is now at 90%.
Related to this, what should be the first layer height in Cura? Shouldn’t it be the same 0,35mm that is the distance between nozzle and bed (I have adjusted it to 0,3 though)?
Doesn’t Cura calculate the fill volume incorrectly if the true distance differs from the numerical value?
bonjour
je rencontre le même problème , impression correcte a 78%
un petit tuto en video serait le bienvenus afin de bien configuré le débit de filament
merci
problème résolus avec une modification de E 200 par E 150
premier résulta correct avec un débit de 100%
et une petite video pour les debutant qui comme moi on bien de mal a comprendre
https://www.youtube.com/watch?v=stWllmdEYwo&feature=youtu.be