Me too! I’ve used PEI for years. Had a really nice sheet of smooth PEI I used on top of the bed on an older machine. Worked like a charm.
The removable plates are a game changer, too bad they can’t make a smooth PEI plate. {Sigh} LOL
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sure there is, the hightemp plate
its my favorite, on textured i had problems with smal PETG things but with high temp everything runs fine 
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Oh. Duh. I have one. LOL
Just missed it was PEI … If you see my brain, send it to me. It’s dented and weird but I’ve grown accustomed to it…!
I’m getting good adhesion still but my top layers are awful too, even with ironing on
Same with me. Printing PLA like a champ UNTIL this AM. Now nothing sticks bed wont heat up. Basically i have a expensive paperweight right now.
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Yours sounds like a hardware failure. Can you manually heat the bed?
I am having the same issue nothing sticks to any of my plates. If I apply glue stick it prints well even although it was printing well without glue stick for 100 hours. Tried everything that I know apart from editing the g-code. I hope they fix this issue quickly.
Is it heating? Also (not to be obvious … 
) have you tried re-leveling your bed?
Last night I was fighting with BL PLA Basic not sticking and found the bed was not level, despite my careful leveling just last week with only a few prints run. 
So you might check it with the little leveling STL, it only takes a couple minutes, a fraction of the time you’ll spend doing 1 stop/start cycle as you can cancel it if it looks OK on 1st pass.
Just a hopeful thought … 
I will try that but if I print with glue stick the prints are perfect.
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Well, plates do wear out. If you’ve a ton of printing on them …
Have you done the usual “clean thoroughly in the sink” routine? I hate the stuff for ecological reasons but Dawn really is good at stripping off anything on the plates. Other ‘dish soaps’ are good, but Dawn has an incredible ability to strip off oils and grease (and old glue) that others miss.
I had a plate I’d given up on and used Dawn and a Mr Clean pad (abrasive!) and it fixed up …
So i thought i would just post up some recent findinds i have had.
Printing on the cool plate i had 3 prints, all the same fail with fitst layer spaghetti defects.
I turned off my office light which is more like a super bright led garage light and next print, boom total success. My room light really does seem to effect the lidar sensor when printing after dark.
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Yep! In another discussion I mentioned I found my OttLite “Daylight” magnifier lamp screwed it up.
I think if there’s outside light sources it can create shadows that confuse the system. I suspect that’s why some people have no trouble and some go nuts, it depends on the angle, brightness, UV level, etc, etc.
A lot of people (me too!) complain about the low light level from the internal light. If you think about it, BL could certainly have used LEDS that would rival the sun, the cost difference would be nothing. They didn’t. On purpose.
We have experts on this forum who say the lidar does not work. 
Yet daily you read about folks adding lots of light to see their prints happening.
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I just make sure instart the print with the room lights off now and the first layer or so is done.
Least i found the cause and its not a problem to me.
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I updated the FW to the latest yesterday and I have been getting spaghetti on every print. adhesion issues with 1st layer to the bed as well as subsequent layers. I used the Bambu labs PEI as well as an after-market PEI without a single problem until today. I hope they come up with a method to roll back.
Try to power cycle the printer, then do a full new calibration cycle for the printer.
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What @Thrawn said, and I’ll add you should make sure you don’t have bright lights and / or multiple lights shining into the printer, it can confuse the camera system.
Keep us updated. I have avoided any firmware upgrades since the last one created more problems than it solved.
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I power cycled and ran the calibration routine. It successfully printed two chopstick holders that were about 1.5 inches long by 1 in wide, two colors with embossed text and logo. however, trying to print anything longer such as AMS Disconnect Tool: (Printables ) shows it still create spaghetti. It will not stick to the bed. I believe the bed and nozzle temp was lowered for PLA in this FW to 55c and 220c…maybe that is the issue…
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Sometimes you will get false spaghetti notifications if the camera lens and lidar lens are a bit dusty
I clean mine whenever I do my maintenance and more often if I’m printing CF as it tends to leave a lot of particulates all over the place especially the rods along with the lenses
As for extra lighting inside the X1C dungeon I run a single strip of LED’s straight down the middle underneath my AMS, it provides extra light in the chamber but not too much as I’ve read that excessive lighting can cause layer issues and false spaghetti detection
Absolutely zero issues with how mine is set up and way more light inside the chamber
I strategically put my LED’s straight down the middle back to front as there is still enough shadow cast that it doesn’t interfere with the camera or lidar
Here’s a pic, sorry it’s blurry I’m in the middle of a print but you get the jist of it
