Hello,
I have been using my Ender 5 for about a month, and have learned a lot. I have upgraded the Ender 5 with the following:
all metal extruder, Capricorn bowden tube, SKR 1.3 with TMC2208 drivers. Skate bearing holder for the filament.

I have good control, now, of the Marlin firmware, and can modify it as I need.

I had been printing for TOO long before I actually learned how to calibrate the machine.
I just printed one of the tolerance tests, with two different filaments (both PETG) 0.4mm nozzle, and
BOTH failed, nothing turned as it should.

My extrusion cube test and CHEP cube are nearly perfect.

I printed a Benchy version last night and was pretty good, but the PETG is still giving me some stringing and
an occasional blob.

Am I supposed to switch to a 0.2mm nozzle before doing the tolerance and Benchy test???