The “new” gold textured PEI plate leaves white residue on all my black prints. Anyone else seeing this? In the photo, the three prints on the right show the white, the other one is flipped over to show the black PLA.
Are you using glue? If not then the issue is most likely due to stress marks from taking them off the build plate.
I sometimes use glue, but not in this print. I suppose there could be some glue left over. I thought about stress and wait until the plate is cool. The white does not wash off with water.
So, no one else has this problem?
Nope this is actually quite a common problem due to stress. The only plate I have is the textured PEI and I haven’t noticed this but also rarely print in black.
There are quite a few threads on white marks in the forum.
Usual remedies are using glue, ensuring that the plate cools off all the way to popping the build plate in the freezer.
To save a marked print, careful use of a lighter or torch on the marked surface is common.
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The original black textured plate never had (and still doesn’t have) this problem. When I think of it, if I need a good dark texture, I go back to the black plate.
Oh, I thought you were suggesting the white was glue residue. I thought that at one point because I had used glue and had white marks. But I get them with and without glue.
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Do you mean the smooth PEI or the original Cool Plate? With the Cool Plate, bed temps are a good 20° lower…
I don’t mean either. I mean the black or gold textured plate.
Ok, I have not seen a prior black textured plate, only the gold one.
residual glue from previous prints is a possibility however if it doesn’t wash off then it is likely stress whitening from a high adhesion force to the build plate.
Stress whitening usually can get removed with a hot air gun, a lighter or torch flame however in case of the need of a matte surface finish that may not work as the heat may result in a slightly shiny finish.
using lower build plate temperatures or using an intermediate layer between the build plate like hair spray can help with reducing/ the adhesion force and with it eliminating the stress whitening on part removal.
How much force are you using when removing the objects?
If they are essentially falling off the plate on their own, this is unlikely to be stress marks.
If you have to apply significant force, that is your first clue that it’s stress marks.
You can remove the plate and lay it on a silicone mat for faster cooling, like this one: Silicone mat @ Amazon
Once the plate has cooled, flex the plate away from the models. i.e. make the center of the plate bow up. This makes the plate “peel” away from the model
Do not do the opposite; don’t push the center of the plate. That results in the edges of the model being pulled up, and the full bottom surface of the model is being stressed
If you have a small butane burner/torch, try going over it quickly. It removes the white from my prints when I get the same. Don’t have the flame on it too long, though.
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Wushau ching shu fu mau ling chu fing mau?
My textured PEI and smooth plate do this if I pull the print when it’s hot. However, I have started seeing it occur even after its cool. I am wondering if some of the coating or something has come off.
I haven’t ever used glue on any of my sheets.
Had that problem as soon as the same print was repeated without cleaning/reapplying glue with to large an interval. Got so bad even outting the print in the fridge did not help removal. Also left an outline on the build plate where previous print residue tryed to hold on for dear life.
It may be hard water deposits. Clean with isopropyl alchol before peinting.
Also i have had glue leave residue. I just wash it off.
A heat gun is your best friend, a couple of passes and you’re good - to be clear, on the model, not on the plate 
Thanks to the several people who suggested a flame or hot air gun. You were all right.
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