Filament will not stick right anymore

[curious aardvark]

yes calibrating is the same as levelling.

I use Simplify3D so before I actually level the bed, I go to "Edit Process Settings", then click on "G-Code", change the "Origin Offset" Z-Axis to -0.1 to bring the nozzle closer to the bed and do a test print

cheers for that. figured that might be an easier way to loosen calibration when it's a bit tight :-)

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just used that - brilliant. I usuallly have the machine pretty tightkly calibrated and it leaves a rim on things. So when i don't want a rim - rather than moving the whole bloody printbed - i can just offset the print nozzle by 0.2 or 0.3 mm.
Works a treat.

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Far as beds warping goes - yes.
Don't know what they put in the dreamer, but the 3mm aluminium plate they put in the creator lasts about 5 minutes. I put it down to the screws being steel and the plate being aluminium, so when it all heats up the screws expand at a different rate and the plate gradually buckles.
I dropped another 3mm aluminium plate on top of mine, attached with pet tape at corners and never had any more hassle with it.