has anyone run into this problem while printing in PETG-HF ? I am getting what looks like a white staining while printing face down plate has already been thoroughly cleaned and untouched by hands. chamber completely cleaned..
Past prints can affect the plate surface and that can the be printed into new prints. This can happen especially if the plate/print wasn’t allowed to fully cool before peeling the old print off.
It’s one of the reasons I use liquid glue on my textured PEI prints. It hides plate defects.
This could also potentially be stress discoloration.
OP, you may wish to pass a torch over the surface very quickly, it may be enough to make it disappear.
Looks like typical black filament thing, you’ll get this on black PLAs too, even on brand new plates
Use a torch or better, heat gun like dewalt 20v etc.
Well the touch definitely took care of that. however I would love to know that is causing it..
only on PETG-HF. and on the P2S I am printing the same lid on the P1S to see if it replicates to determine if is machine setting or a filament issue.
Ps it appears when printing a blk/wht combination
I mean this is a pretty well documented things for black PLAs too, heat stress/stress fractures irrc. On some plates that auto releases print when cooled it can be avoided somewhat
I did a test print last night and cooled overnight and still there.. so I am starting to think that is a bed temp issue maybe lowering the temp a few degrees on the bed. and test again.. I don’t have an adhesion problem.the plate new so that won’t be an issue
So I just removed the lid form the P1S same issue.. and it carried over from the p2s. so I am Thinking is a temp distress problem, the print profile from Bambu calls for 245 temp on the nozzle and 70 on the bed.. I think to lower by 10 degrees. on the bed or the first few layers..
So for anyone who might be interested, I think I have found the solution to this problem. I changed the printing sequence from Auto to customized then made Black first then white after for the first layers. did three prints and no white shading all gone!.
this will work with any other material ABS PETG PLA…
I added 
for this statement.
Not for this as it is unnecessary for everyone, and I have never needed it or used it.
Better written point.
It may be necessary for some but isn’t necessary for everyone.
I disagree here. It is necessary for me and my system/procedures. I have tried not using glue and prints can absolutely have issues or fail.
If you are saying not everyone needs glue then I agree. Not everyone does. It depends on a number of things. But I never said everyone needs glue. I said it is “one of the reasons I use liquid glue”.
I don’t and wouldn’t, @MZip means something and it is all good.
I didn’t suggest or imply you did.
Not for this as it is unnecessary for everyone.
Using glue (any type) is environment dependent, thus the unnecessary.
and I have never needed it or used it.
My experience. This doesn’t negate yours.
Feel free to suggest how I could have worded this better.
My reasoning…
…environmental issues affect a print and how to resolve it. Newbies read “use glue” or “don’t use glue” and lack the understanding of its environmental context. We (me included) rarely add this context as for us, our experience is correct.
I have never nor needed to dry my filaments, that information requires context as my experience appears far less common than others. Leaving doors open on the P1S was the only advice, for me, doors (and lid) closed works better.
We can’t always add this context, so I shared the logic, that not all is equal.
This should never be taken as saying you were wrong or lying. Partly, because your experience isn’t mine and mine isn’t yours. Mostly, you are you and never offer bad advice and are quick to help.
I’m glad it was a misunderstanding. It didn’t seem like you.
My interpretation of the way that sentence is written is “unnecessary for everyone” is the same as “necessary for nobody”.
The way I would express the idea thinking about it is to state both “may be necessary for some but isn’t necessary for everyone”. I’m no english major and it was my worst subject, though.
But that covers your experience - that it isn’t necessary - and mine - that it is.