My new favourite 3D printer bed leveling method

Should I heat the extruder when bed leveling, or leave it cold?

 

If hot, how do I deal with oozing filament?

This is my new method which addresses these issues.

3D Printing: humidity & keeping your PLA filament dry

It is generally agreed that you should try to keep your reels of PLA filament dry.

 

But I'm not sure that all suggested methods on the net make complete sense!

So here are my mad ramblings on storage and relative humidity.