Core One L bad VFA's and really bad ghosting
i have been through prusa support and they have no idea why its doing it. bit of a sham considering they advertise they "all but eliminated VFA's" and "Flawless precision" these VFAs are so bad i can feel them..
I checked the belt tension, they are within spec, the gantry is not skewed, i did a accelerometer calibration and nothing changed at all. this is the 2nd prusa core one L i bought had to send the first one back due to faulty linear bearings, and other assembly problems.
A picture would help.
VFAs are, by definition, extremely fine so if you can feel them there may be something else involved.
Can you supply a file that shows the problem?
Best is a .3mf (zipped) ...
Files > Save Project as
Zip the .3mf and post it here. It will contain both your part and your settings for us to diagnose.
Cheerio,
RE: Core One L bad VFA's and really bad ghosting
Hi there please see attached for the .3mf i will grab a photo or two in a second i can definently feel the waves in the part from the printer. still waiting on the email from Prusa if they come up with a solution i will let you know too
RE: Core One L bad VFA's and really bad ghosting
There's nothing obviously wrong with that file.
I have noticed that a high proportion of those with recent problems are using a BALANCED profile as are you. I have no reasonable grounds for suspicion but it would be worth checking the output using other profiles and perhaps slowing down the print.
Cheerio,
RE: Core One L bad VFA's and really bad ghosting
But the "Balanced" profile was specifically introduced and advertised by Prusa as part of their VFA countermeasures. Go figure..
RE: Core One L bad VFA's and really bad ghosting
It's there on all print profiles.. it's a bit rude of them advertise a vfa free machine for it to be full of them
... and it's (mostly) those concerned with VFAs who use it - some may even apply it automatically when there is no original problem to fix. I wonder if misuse might increase the problem in the same way that wrongly connected noise-cancelling headphones turn into noise doublers...
It is worth making a comparison either way, perhaps the preset is masking something worse.
...but I am at some disadvantage here as I've never had VFA issues (I may well have had VFAs but I don't notice them and for my applications they never matter.)
Cheerio,
It's there on all print profiles..
OK, try moving the printer to another bench or even the floor temporarily in case there is some odd resonance-coupling issue.
Cheerio,
RE: Core One L bad VFA's and really bad ghosting
Once it's finished I will try that what's concerning is the prusa agent stated they have never seen these machines ghost before
RE: Core One L bad VFA's and really bad ghosting
It's there on all print profiles.. it's a bit rude of them advertise a vfa free machine for it to be full of them
I don't think the artifacts look like typical VFAs (belt ripple) found in the Core One. Those should always be "in phase" when the print head is back to the same XY position. But e.g. after the small through-hole, the ripple pattern is shifted, repeating the hole contour for a long time. You mentioned ringing in the original post, but would ringing really keep going for so many periods, with apparently unchanged amplitude?
Since you have already checked the belt tension and done an input shaping calibration -- could it be uneven flow from the Nextruder? Maybe you could try to print a single-layer vertical wall to check whether the "VFA" pattern is a variation in thickness or in position? (I.e. whether a "valley" on one side of the wall correlates with another valley or with a bump on the opposite side?)
RE: Core One L bad VFA's and really bad ghosting
I will give it a try after it's finished doing it's print luckily it's not cosmetically important
RE: Core One L bad VFA's and really bad ghosting
So I paused the print and put it on the floor to see if that makes a difference. It hasn't, you should be able to make out the line where the pause happened this is also slowed down to 70mm for the external perimeter and small perimeters
RE: Core One L bad VFA's and really bad ghosting
Assuming PETG? Brand? Is it Dry? Which filament profile are you using? The overall print quality in the last pic, needs some improvement before you can address anything else.
Calibrate extrusion for the filament profile.
Measure diameter of the filamentMultplier, by using hollow cube, measure the wall thickness, See Precise Method --> https://help.prusa3d.com/article/extrusion-multiplier-calibration_2257
https://www.thingiverse.com/thing:271736
Print the Cube with 1 perimeter, 2 bottom, no top so you can measure wall thickness.
Once you have the extrusion set correctly, you will need to adjust the temp, use a temp tower, reduce stringing.
After that,
May have to adjust the filament profile settings and slow down the speed some more.