Prusa supplied filament profile accuracy.
Trying to help a friend with a different filament. Prusa supplies a profile for the filament in their configuration. Prints with it fail. Temperature is much lower than temp tower test. Doesn't stick to the bed. Splits part way through printing.
Spectrum HT 100 PETG is the filament.
How much testing and confirmation of the suggested filament does Prusa actually do, if any?
RE: Prusa supplied filament profile accuracy.
Trying to help a friend with a different filament. Prusa supplies a profile for the filament in their configuration. Prints with it fail. Temperature is much lower than temp tower test. Doesn't stick to the bed. Splits part way through printing.
Spectrum HT 100 PETG is the filament.
How much testing and confirmation of the suggested filament does Prusa actually do, if any?
There are too many variables to contend with. Example: different nozzle materials, dryness, even the color of the filament will affect how it prints. Vendor provided profiles for me are just starting point and not the answer.
RE: Prusa supplied filament profile accuracy.
I agree with the comments about settings. I would expect Prusa to provide profiles tested with their printers. I have had good (not great) success with the defaults so far.
Default Core One+ kit and default nozzle.
I guess I can assume that the filament isn't tested and tuned by Prusa when they supply a filament profile. Thank you.
As I understand it - and I could be wrong; Prusa fully test the filaments they sell but generally rely on the manufacturers of other filaments to submit profiles for their own products on the reasonable assumption that they know their own filaments best. Some manufacturers are more diligent than others in this regard and may not keep up with newer models.
In the early days I believe some users submitted profiles - I doubt many of these remain.
Cheerio,
RE:
As an interesting example, for PC Blend the XY shrinkage is set to 0.18%. When I measured it, it was 0.71% (if I remember correctly but it was around this number). Over a 300mm bar, that is a 1.6mm difference which is pretty significant if you are trying to fit a part with screw holes. Not sure where Prusa got 0.18%. If you are printing smaller parts however, for example a 100mm part, the difference is 0.53mm which is just over the extrusion width of a 0.4mm nozzle.
But then I don't think Prusa anticipated (and they warn against) printing large parts in PC Blend due to warping if not accurately controlling temperatures.
Shrinkage can be lay dependent. Along the lay you will get one value, across another and where layers cross each other a third and even that can vary according to angle.
Cheerio,
RE: Prusa supplied filament profile accuracy.
Shrinkage can be lay dependent. Along the lay you will get one value, across another and where layers cross each other a third and even that can vary according to angle.
Cheerio,
Shrinkage is an intrinsic property of the plastic and XY% is an average of shrinkage of X and Y. It won't change much due to orientation on the bed unless there was a large difference in X and Y to begin with. Typically for plastics with a large amount of shrinkage it amounts to a 0.10% - 0.05% spread due to orientation, which is insignificant.
The really difficult part is measuring accurate shrinkage along XZ and YZ. That can change based on so many factors. Example, layer heights, type of infill, size of the nozzle.
RE: Prusa supplied filament profile accuracy.
I bet that the shrinkage values obtained by different people, even based on the same model (the infamous Califlower ) will differ significantly. For instance, I got o,35% for Prusament PC blend, 0,4% for Prusament ASA and 0.1% for Prusament PLA. I won't say that my figures are correct and everybody else's wrong, it's just that there're many variables to consider.
RE: Prusa supplied filament profile accuracy.
An interesting discussion on shrinkage. I would say I am anal about accuracy, so have tuned it pretty well for my usage. I think people will get different shrinkage levels due to many factors. Machine build errors down to warn nozzles when doing calibrations.
I am more concerned about temperature and cooling for any filament profile that Prusa supplies. I agree it should be a starting point for that filament and you should get okay prints, not absolute failures and should still need to be calibrated for shrinkage and proper temperature.