Why doesn't PLA stick to heated bed? I have a basic Creality Ender-3 with a black rough bed cover. I'm printing with PLA.

After assembly, I printed 3 or 4 small toys sliced by Cura with basic settings. All were printed very well!

However, after that, extruded filament would not stick to the bed. I tried the following:


Bed calibration with A4 paper (each corner with a tight nozzle to paper and repeated calibration again)
Once raised up the bed temperature from stock 50 to 60&nbsp;&deg;C
Washed the bed with a soap and water (and dried)
Sprayed with a hair spray
Changed the filament


Nothing helped so far.

What else can I try?
I think you may have used the wrong substance to clean your bed. Try using Isopropyl Alcohol (IPA). You may have left some residue behind from the soap, which is now interfering with adhesion. When that is done, ensure you've gone through the steps for bed leveling again. It's amazing how much of a difference proper bed leveling makes in adhesion. If it still doesn't work, post some pictures up of your results, which will help tremendously in getting you a better answer.