Prusa Core One Branded Build Plates Are Awful
Bought the Prusa Textured and Satin Powder Coated plates. I've only been printing Prusament PETG and clean before use with 99% isopropyl while cold.
Brand new Prusament PETG filament straight from the bag to the drier for 6 hrs before printing:
1. The satin sheet powder coating is already wearing off after 2 days of use and it stains very easily if water gets on it (no I didn't wash them in the sink). Also, the first layer is terrible with ripples in the center of the sheet and warping.
2. The Prusa textured sheet is even worse. First layer doesn't stick well at all with PETG. After 4 attempts, I replaced it with a $20 no-name brand from Amazon that works perfectly each time.
Of course I contacted support over chat and they referred me to the quality control department and I've had not response to follow up emails over the last 2 week.
These photos are the results of printing on the Satin sheet with rippling caused by and adhesion problem and also showing "water marks"
Anyway, lessons learned I suppose. 
Fourth attempt printing on the Prusa textured sheet with Prusament PETG
First Attempt with $20 sheet from Amazon
RE:
It's a bummer that you're having a poor experience with Prusa build plates. There are many thousands of Prusa customers (including myself) who have had an incredible experience with the satin sheet.
The very first order of business with any new build plate should be to scrub it really well in the sink with warm water and dish soap.
Also, are you saying they the watermarks are showing up on your build plate spontaneously? Nothing at all had spilled on them, no fluids dripping from above the printer perhaps? It's common for there to be harmless outlines of previous prints being visible on the build sheets, but organically shaped watermarks are something else and would make me think that there must have been a previously spilled liquid that is both effecting adhesion and collecting dust/dirt in the shape of the stains.
I should add that it's poor form to post here suggesting that an entire product is faulty because you are having a bad experience with one example of it. Prusa satin sheets are highly respected in the hobby, having proved themselves over and over to be reliable and effective. I agree that something is up with your experience, but either it's solvable with a good cleaning or as support suggested it may be a quality control issue.
-J
RE:
2 out of 2 build plates I've purchased recently are bad. I did not categorically state that all prusa build plates are bad. I'm still using the satin build plate from 2 years ago. The one I most recently purchased is obviously flawed and I've been struggling to get a replacement. After speaking with support, the QC team will not return my emails. Anyway, I have found $20 alternatives that, in my experience, are better quality and certainly much cheaper.
The stains are caused by water. I purposely dropped water on the plate and, yes... it creates these stains. It is not a case of "liquid leaking from above"
RE: Prusa Core One Branded Build Plates Are Awful
Ive only use the stock Core One smooth, and the Prusa textured so far.
Smooth plate was fine for PLA - no issues at all. I then printed one PETG object on it - also OK.
I then tried 10 PETG objects on the textured. Terrible experience, Had to cancel half of them due to terrible warping etc.
Switched back to smooth - the items printed fine - no warping, and completed, but now I notice little dips, or dimples, on the surface of the sheet where the PETG prints were. Never had this before.
I haven't tried my Satin sheet yet, and I must admit, I'm not looking forward to it at this point.......
RE: Prusa Core One Branded Build Plates Are Awful
I won't insult you by asking whether you clean your plates (washing-up liquid and hot water) if you control your temperature, which is generally too hot for the nozzle and too low for the plate... and your speed.
I've noticed that a lot of people want to race against the clock... and they always lose...
But I've never had any problems with the plates.... on the core one I use 2020 plates from my MK3, which has evolved towards the Core One
MK3S + MMU2 migrée vers une MK4 +MMU3 , puis vers MK4S MMU3, en attente du kit upgrade Core One, Elegoo Mars, bricole sur Home assistant, arduino, 8266, Esp32, kicad, Freecad et Fusion 360
RE: Prusa Core One Branded Build Plates Are Awful
Textured plate has been nothing but warping, layer shifts and that's if I can get past the first layer. I'm using the sheet that came with my MK4 that works better. And again, not trying to say that all the sheets are bad. But so far, on recent purchases from Prusa I'm 0-2
RE: Prusa Core One Branded Build Plates Are Awful
I actually agree the textured plate has been annoying for me due to adhesion issues and warping. Even at the max recommended bed temperature for the filament, I've found the prints eventually lose grip on a corner and start warping--even after thorough cleaning. I feel like the cheaper $20 one I got on Amazon for my workplace's printer works better.
RE:
I won't insult you by asking whether you clean your plates (washing-up liquid and hot water) if you control your temperature, which is generally too hot for the nozzle and too low for the plate... and your speed.
I've noticed that a lot of people want to race against the clock... and they always lose...
But I've never had any problems with the plates.... on the core one I use 2020 plates from my MK3, which has evolved towards the Core One
Same filament, exact same print settings, exact same sheet cleaning method and radically different results between the expensive Prusa plate and a "noname" $20 plate from Amazon.
Update: QC (more or less) admitted to a problem with the sheet and are sending me a new one. Hope it's better than my 2 year old Satin sheet that I still use in place of the new one I recently purchased.
RE: Prusa Core One Branded Build Plates Are Awful
I received a Core One textured and Core One satin sheet today. After cleaning the textured one with dish soap and hot water I did a short print with Prusament PETG Jet Black and had no problems. I don't have any of the marks that yours has.
RE: Prusa Core One Branded Build Plates Are Awful
I received a Core One textured and Core One satin sheet today. After cleaning the textured one with dish soap and hot water I did a short print with Prusament PETG Jet Black and had no problems. I don't have any of the marks that yours has.
Yes. I never meant to imply that all Prusa sheets are bad. Just the 2 that I recently purchased are definitely bad... I'm making this number up, but if there is a 2% failure rate then I just happened to hit that 2%.
RE: Prusa Core One Branded Build Plates Are Awful
This is great to hear, as I have 6 or 7 plates from my mk3, many of them barely used.
I found that overtime, even though my original smooth plate got ickier, the adhesion wasn't impacted at all, even though its pretty battered at this stage and impossible to get genuinely "clean".
I've also a scratched power coated plate that works just fine.
RE: Prusa Core One Branded Build Plates Are Awful
This is great to hear, as I have 6 or 7 plates from my mk3, many of them barely used.
I found that overtime, even though my original smooth plate got ickier, the adhesion wasn't impacted at all, even though its pretty battered at this stage and impossible to get genuinely "clean".
I've also a scratched power coated plate that works just fine.
In my case, both plates were bad right out the box. Prusa sent me replacements so will report back when I get them.
RE: Prusa Core One Branded Build Plates Are Awful
I'm also still using plates from my Mk3 days. What I have noticed is the textured plate can cause adhesion problems even after washing and/or using 99% IPA to clean it. The fix for me is using a glass cleaner that contains a small amount of ammonia like Windex (USA) or Elbow Grease or the like (UK) before EVERY print. My favourite "Stardrops" seems to be no langer made 🙄
RE: Prusa Core One Branded Build Plates Are Awful
Have the same problem with the textured sheet on my new Core One. Both first layer and warping issues.
On my Prusa Mini the textured sheet has always worked great with PETG.
The satin sheet however works like a champ.
RE: Prusa Core One Branded Build Plates Are Awful
The new satin sheet that Prusa sent me as a replacement works perfectly. I cleaned the first version they send and the new one in precisely the same way, made a test print under the same conditions and the new sheet was flawless and the old one was a mess (sorry I don't have photos). This does imply, at least in my case, that the coating on the first sheet was defective. As for the textured sheet, I've given up. I've found the cheap $20 textured sheets on Amazon work much better so I'll stick with that.
RE: Prusa Core One Branded Build Plates Are Awful
First thing is -- how do you clean the print sheets?
If it isn't under flowing water, as hot as you can stand, with a drop of Dawn dish soap on a fresh paper towel, scrubbing the surface and handling the sheet only by the edges, until water is sheeting off leaving no wetted areas, your print sheets are soiled.
Wash multiple times, rinse in the hottest tap water you can, the water should flow off and leave a mostly dry sheet. Dry the spots that remain with a fresh paper towel. Handle only by the edges, place the sheet on the heater bed, the smooth PEI is ready to go, the textures need a short bake at 50c or more to ensure no water remains in the crevices. I just start printing and let the preheat do the drying.
It is a numbers game. One fingerprint goes a long ways: and a few drops of alcohol just dilutes the oils and you end up spreading it around. If you use a few milliliters of 99% alcohol and a good microfiber cloth, you can get kind of clean. But gallons of hot water and detergent lift the oil and rinses it away.
RE:
Ive only use the stock Core One smooth, and the Prusa textured so far.
Smooth plate was fine for PLA - no issues at all. I then printed one PETG object on it - also OK.
I then tried 10 PETG objects on the textured. Terrible experience, Had to cancel half of them due to terrible warping etc.
Switched back to smooth - the items printed fine - no warping, and completed, but now I notice little dips, or dimples, on the surface of the sheet where the PETG prints were. Never had this before.
I haven't tried my Satin sheet yet, and I must admit, I'm not looking forward to it at this point.......
I've been using the BT-25 for basically everything... PLA, PETG, PETG Cf, PC, PC CF, PETG GF, ASA, ASA-GF, ASA-CF, ABS... no nylon, but I think that requires a different build plate? Honestly, I like the Glacier pate too. I've got that in my H2D and I don't even use the Bambu one anymore....
RE: Prusa Core One Branded Build Plates Are Awful
First thing is -- how do you clean the print sheets?
If it isn't under flowing water, as hot as you can stand, with a drop of Dawn dish soap on a fresh paper towel, scrubbing the surface and handling the sheet only by the edges, until water is sheeting off leaving no wetted areas, your print sheets are soiled.
Wash multiple times, rinse in the hottest tap water you can, the water should flow off and leave a mostly dry sheet. Dry the spots that remain with a fresh paper towel. Handle only by the edges, place the sheet on the heater bed, the smooth PEI is ready to go, the textures need a short bake at 50c or more to ensure no water remains in the crevices. I just start printing and let the preheat do the drying.
It is a numbers game. One fingerprint goes a long ways: and a few drops of alcohol just dilutes the oils and you end up spreading it around. If you use a few milliliters of 99% alcohol and a good microfiber cloth, you can get kind of clean. But gallons of hot water and detergent lift the oil and rinses it away.
Yes... Hot water, Dawn and 99% IPA between prints. Sheet was simply bad.