Extruder height from bed

Hello,
Just fine tuning my Perusa and was curious
how far the extruder should be from the bed, have seen
examples of sliding a piece of paper under the tip?
or a MM?
Thanks!!
Tayana

With the extruder cold, the gap between the bed and the nozzle should be about .1mm which happens to be the thickness of a normal sheet of paper. Some people use paper, some use feeler gauges.

A business card works well

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Get a piece of regular paper (0.1mm thick) and slide it under the nozzle. You should feel it definately dragging against the nozzle but when you pull the paper out you should be able to re-insert it without having to raise the nozzle. You need to make sure the nozzle is that same distance (same feel) on all 4 corners of the print bed. Once you get the same nozzle distance you can fine tune it by adjusting the Z endstop switch position. It's something you just get a feel for until you get tired of it and upgrade to a retractable endstop.

Thank you EVERYONE
Mahalo!!