English is not my first language, so sorry in advance for some typos.

I have my Creality Ender 3 printer for some period of time now, like 6 months or so. I just can't seem to level the bed properly! Whenever I have the 4 corners the same the middle always has to much space between the bed and nozzle.

This is what I do: Put the nozzle at home position. Disable steppers to I can move the bed and stuff. A piece of paper should be moveable between the nozzle and bed. Nobody can explain to me what I should 'feel', because you can't explain a feeling. So this is try and die, I understand. I do all corners until all corners are the same 'feeling'. But the middle of the bed is never correct. I should expect the same 'feeling' as in the corners.

This is what I have done:

• Leveled with heated and unheated bed
• Added better springs under the wheels for leveling
• Replaced the default bed with a glass one.
• Check every bold and screw I can find
• Adding piece of paper to heighten curtain parts of the beds... But how much can I add? I get the feeling I already put to much under it! Doesn't this effect the heating??

This is getting really annoying. Especially when I read all those success stories of people printing the best stuff with this printer and saying "how easy this is".

What else can I do?