S/He said s/he doesn't want to adjust it while starting the print, in fear of damaging the nozzle.
I'd be curious too.
Since we want to squish the first layer and we send the equivalent of 0.3mm, then I would suggest you to try to level and print at 0.2mm gap to start and then adjust by +/-0.05mm according to the output.
And if you can, maybe go for a dial gauge? There are easy fixtures to set it up on the print head to check this. Because with your feeler gauge you basically fall back to the paper trick: what to decide if you can slide your gauge but it's kind of scratching ? (especially since the bed is on springs).
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DidierKlein 729
Usually i don't relevel the bed when i change the nozzle. Some users do some don't.
What i do personnaly when i change the nozzle:
During the printing of the brim or the skirt (i usually go for a skirt of at least 3 perimeters.
I fine tune the level of the plate with the 3 level screws.
You want your first layer to be squished but not too much, if it's almost transparent you are too close, if the layers is not squished and are "rounded' then you are too far.
If your first layer is 0.3mm then the bed must not be perfectly leveled
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