A little advice on print quality
I have had my Core One for a few months now. And for the most part, I love it. It's not perfect, though (nothing is).
Lately, I have been seeing an increase in part failures. I see alot of warping on the build plate layer and I see these occasional burn marks.
I routinely wipe the build plate with Alchohol (I even flipped to the other side, for the first time, just the other day). I just cleaned my plate with soap and distilled water so I shall see what that does.
Are there any pointers or settings I need to change to fix this? Or do I just have to order a new plate already...
I have not been using glue.
(I also see "ghost" imprints of the last print on my new print despite cleaning)
RE: A little advice on print quality
So I see a couple of different things in your pictures. The first is, as you may have already suspected, first layer adhesion issues. You mentioned that you cleaned the plate with "soap" and distilled water. The recommended detergent for cleaning is Dawn (Fairy) liquid dish soap, preferably with no perfumes or antimicrobial additives. The procedure is to use a mildly abrasive scrubbing pad and HOT water. Scrub thoroughly and rinse completely with HOT water. Isopropyl alcohol has a bad habit of just pushing oils and contaminates around if they are severe enough (or worse drawing new contaminates out of whatever you are wiping the plate with!).
If you are printing with other than PLA (you didn't mention your filament type but I am assuming PLA based upon the smooth sheet) or are printing models with square corners and long edges with lots of infill you may need to add a "brim" or "helper disks" to the model to help prevent warping. Worst case you may need to add a 3d print adhesive such as Magigoo or Vision Miner's Nano Polymer adhesive to promote better first layer adhesion.
As for the "burn" mark that looks like a piece of burnt filament that came off of the outside of the nozzle and ended up on the print. If your filament is producing fine wisps of filament (stringing) during movement from layer to layer those fine wisps can get stuck to the hotend where they cook for awhile before becoming dislodged in just the right place to ruin your perfect print :). If you don't already have one, get a small, brass wire brush, heat the hot end to extrusion temperature and brush the nozzle clean before you begin printing.
The ghosting that you see on the smooth PEI plate is, unfortunately, a combination of the PEI surface changing due to filament contact as well as impurities in the filament (silk PLAs are some of the worst actors) leaving deposits on the bed. They can be reduced via a good scrubbing as described above but the only thing I've ever found that will eliminate them completely is cleaning the plate with Ethyl Acetate. Note that I have no first-hand knowledge of the long term effects of using this on the PEI surface (it doesn't appear to attack the surface like acetone for instance) but the one plate that I've experimented with it on does not seem to have suffered any ill effects after several hundred hours of printing.
Good Luck and I hope this is of some help,
Steve
RE: A little advice on print quality
Thanks for the advice.
I do use Pla, and I cleaned with dish soap.
I used distilled because i am under a temporary boil order. I will reclean hopefully tomorrow when its lifted.