I did print a simple box with first layer having a text marking.
My issue is the first layer does not feel uniform with what i can express as an halo (see pricture bellow):
That looks like a ghost from a past print that the new one picked up?
You could maybe use glue stick but the tiny ridges can show. Maybe liquid glue carefully applied would allow that build plate without ridges from glue stick. Both would be a barrier between a model and any residues if you can’t get them off.
Or print the first couple of layers a few times until the residue is gone.
But on something like that I’d go with a textured plate. It hides the extrusion lines and other issues pretty well. May also need some calibration with those very defined extrusion lines.
Mzip,
Thanks for your answer.
I did try to change the plate to textured plate. I did wash it with hot water and souap.
It is better but still not good enough.
I printer a full part yesterday. Still i can see some white halo.
I printed again 2 layers only and i again have white halo not at the same place (i did place the piece exactly at same place using bambu move coordinates).
I also notice i feel i have underextrusion on blue (navy) color.
The underextrusion is possibly a flow calibration issue and there are procedures to get that adjusted properly in the Bambu wiki.
I was thinking the halo was a small amount of residue from a previous print being transferred to the new print which is why I mentioned printing first layers a few times to “clean” it away if possible.
I’m assuming the textured plate has been used before too? If it hasn’t maybe the halos are something else though.
Are you using any barriers / release agents? Glue stick and liquid glue would both keep your print from actually touching residues that could transfer a halo. Or if the halo is glue, washing the print with warm water and soap may clean it off the part?
Did try without real success
I also try to change filament, it is better with lighter blue (from bambu in this case) (but i think problem is not solved)
Yes it was the case.
Not yet tryied. How do you prevent that glue leave a marks on printed parts ?
What is you best experience in glue (white PVA glue i already used on Ender 3 for nylon filament but esthetic was not any concern at this time)
Any idea is welcome. Thanks all for your answer, very appreciated.
So depending on the material you are using this could be very light plastic / filament stress marks from pulling the model off the plate.
For example when you bend a piece of plastic and you see it turn white.
I’ve experienced this as well When using textured sheets and after the print has cooled but has not entirely released from the build plate.
there’s a few things you can do.
Using glue of course can help with release - I Usually put glue in a cross pattern in all directions and then take a Damp paper towel and spread the glue evenly so there aren’t any chunks or white residue elements visible.
After the print is completed you can put the build plate in a freezer so it naturally just pops off without being pulled - this has worked many times for me but it all depends on how much room you have in the freezer and how large the model is of course.
if you have a heat gun, put it on a heat setting that is appropriate (what this is - is usually just enough to heat up the part without melting it) - you can wave the heat gun across the print gently back and forth (DO NOT keep it in one place) and that will slightly heat up the filament and make the white disappear. I have also have done this in the past and it has worked perfectly.
For some reason I can’t attach pictures with my mobile device because it says they’re too large (Another existing Mobile experience issue with their forums) - But if I go back to this post later on my PC I will show you the results from one of the prints that I made.
First, @mgtarallo might be onto something about it being stress marks created during separation. Depends on how hard it is to get prints off.
But if it’s residue from a previous print, glue might be a good barrier to keep the new prints from picking up residue from old. If it’s stress, glue would be a way to decrease that during separation.
I haven’t used liquid glue yet but others have mentioned pouring a little out onto a plate then gently spreading it out with a cloth or maybe paper towel into a thin layer across the plate. Glue stick obviously leaves little lines and layer effects depending how thick it is applied but I’ve seen people say they apply stick, warm the plate, and spread the melted glue stick. Mine seems to set up and not flow when heat gets to it so hard to say.
I would guess liquid glue is the better way between the two and people do apply it even to textured PEI.
Did you ever get further along with this? I have this issue like crazy when printing with dark filaments. I do think it has something to do with high adhesion areas on the bed. I was removing prints too fast and getting loads of this. Started waiting and it helped but didn’t go away completely. Now I’ve got another brand-new P1S and it’s worse than ever. Way too much adhesion going on (matte PLA). Even if I wait for the bed to fully cool the print is stuck so hard it gets damaged when removing and marks all over it.
I did find a way which help clean it up a bit. Works fine for lighter markings but not the heavy ones. I use a propane torch with a wide flame disperser on it. I run the over the print quite quickly to reheat the filament. Have to be very careful not to over heat of course so keep moving and don’t overheat one area. I’m sure this is a similar thing to what some have mentioned with the hot air gun but I had better results with the propane torch. I think because its short more intense heat.
That’s crazy!! Glad there is somewhat of an easy fix. Otherwise, most of the parts I print wouldn’t be useable/sellable.
Is there a better way to control the amount of adhesion? I hear lots of people struggling with not enough adhesion. I tend to always have a little too much. Only one plate I bought from Juupine on Aliexpress and I can’t seem to get anything to stick to it. It has a cubic sort of pattern on one side and little hexagons on the other.
Cheapest one out there. Just spray an even amount across the plate, let it dry and use.
When it becomes a bit stubborn to remove, clean away existing hair spray with hot water, then soap + hot water. Apply new coat of hair spray after that.
Glad there is somewhat of an easy fix. Otherwise, most of the parts I print wouldn’t be useable/sellable.