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It hasn't ?\_(ツ)_/?

I checked, but the filament comes really smoothly from the roll.
Could it be that the hotendor nozzle are (partly) blocked? That doesn't really fit the varying density of the print, but maybe this...

I just started to print my first really large object and had huge problems with the filament output. As you can see on the pictures, the filament seems to have been outputed fine in the beginning,...

How long was it in use?

Which CAD software did you use?

Nice info, thanks!