Possible slicer error?

#1

Hi Elco,
Everytime i

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I print a more or less complicate part I always get such foam like skins wich is not fully cured and corresponds to inner structures. All in all it’s not a smooth outer surface. I get this with the Elegoo Saturn and the Anycubic Photon M3 as well. The layer thickness is 50 um but it appears with 20 um as well. The whole thing is a little bit annoying. I can clean it with alcohol but it is still barley visible. At bigger parts the shift could be up to 0,2 mm. Do you have any clue from where this problem might come from? It apperead with older versions of the software also.
Kind regards Bruno

#2

Hi Bruno,

  • have you inspected the slices? (print jobs -> import printjobs, allows you to overlay the slices on your model).
    If you don’t see anything strange there, then it probably has to do with force differences.

  • if you do see something strange; thatn it’s a setting or problem with slicing.
    Usually unsolidified resin corresponds to anti aliasing and partially cured pixels. You should be able to see that in the sliced files.

You can also send me a sliced file (wetransfer/googledrive) and i’ll have a look for you.

kind regards
Elco

#3

Hi Elco,
Thank’s alot for your quick reply. Where can I find the link for Google transfer ?
Kind regards Bruno

#4

hi bruno,

you can use wetransfer to our info at address.

Elco

#5

Hi Bruno,

Out of curiosity, the banding seen on the print, is that due to variable layer heights? or other parts on the print bed that had large cross-sectional areas at the heights where the banding occurs?

Best,

MarkCK

#6

Hi Mark,

No, none of this. It appears also if the part is alone and the layer height’s are all the same. It’s independent of the printer. Even with the Phrozen Sonic 8K. All my parts are designed with Rhino 8 but if I download any files from the web I get the same issue. Interestingly it appears only at the outside. Inner walls are smooth. It oesn’t matter if it’s 20um odr 50um slicing.

#7

Thanks for sharing. Sounds very odd. I will be interested in what Elco finds.

#8

Hi Bruno,

I didn’t receive any files yet correct?

Elco

#9

Hi Elco,

Sorry, I don’t know how to use wetransfer.
Kind regards

Bruno

#10

Wetransfer.com is just a file transfer service, you upload your file and enter our info@ address as email to send it to. But if it’s under 25mb you can also email it directly, or you can hand me a google drive/one drive link.

I"m still planning on making an upload tool for issues like this… but lack of time…

kind regards
Elco

#11

Hi Elco,

Sorry for my late reply. I checked it out with the original Anycubic slicer and got more or less the same result. It’s strange anyway but not a issue with the slicer for sure. I only used Formware Slicer so far in the past. It’s the most convenient slicer I know.
Sorry for your inconvenience and kind regards
Bruno

#12

Hi Bruno,

No problem. good to hear it’s persistent across software. Then it’s a geometry or exposure setting problem.
If it’s across machines then it could be exposure related? To high exposure? Shrinkage changes across sections?

Have to admit i’ve not seen these issues before.

Elco

#13

Hi Elco,
Thank you for your reply and the hints. I’m looking forward to check it out once soon.It cannot be overexposure because it’s at the lower limit to cure at about 4.8 seconds. I suppose the problem might be the FEP or nFEP. I try it out now with ACF and will see if anything is changing. Ill keep you advised.
Kind regards
Bruno

#14

Hi Bruno,

Looking at the photo’s again; it looks like it only happens at the point where you have a suction cup or large areas. Once the hole on the side of the part starts; the problem is gone. Right?

Elco

#15

Hi Elco,
Yes, exactly. It looks likte there is a correlation of what’s inside. Everytime if there is a changing in the structure it’s visible outside. I cut out the part with boolean function and so it must be a solid without errors. Interestingly the same issue appear with the chitubox slicer. I’m a little bit confused about and I have no clue what the reason might be. It looks similar to a blooming effect but why?
I used it on a Elegoo Saturn and a Anycubic Photon M3 plus. The slices are 50 um.
I send all the files from a more complicated part to you on email because I don’t want to create a wetransfer account. Maybe you’re interested to check it out by yourself. If all is okay at your site so please let me know the printer confuguration you used.
Btw: In wich function I can adjust the elephant foot compensation? Is it the pixel correction? What does mean Z-correction?

#16

Hi Bruno,

I’ll check the files one of these days.

Elephant foot copmensation is called ‘xy compensation, or xy offset’. It’s an absolute offset for the curves.
You find this under machine -> print profile -> xy compensation

zbleed is vertical correction of light penetrating to deep and thus curing to far. This should not be the cause in this case.

kind regards
Elco

#17

Thank you
Kind regards
Bruno

#18

Hi Elco,
A brief update about this issue. It seems to be that the resin and the release film might be the reason for it. I changed the FEP film and now using ACF film, have slightly changed the exposure time and use other resin. Anycubic standard and Wanhao seems to be poor quality. With Prima value resin I get better results. The issue is now beary visible.
Greetings from Basel

Bruno