Thanks @codesections well that would be crazy but not impossible. At the place (a local FabLab https://www.fablabs.io/), where I was printing it, someone was in the past trying making a chocolate 3D printer.
They could made the chocolate filament, even it was printing just fine, however the melted chocolate wasn't cooling fast enough to hold any shape and they got stuck there. Although there are DIY https://www.thingiverse.com/thing:3511736/ as well as commercial printers that can actually print chocolate.
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