M6x1 cap nut for "Filament Dry box cheap and simple"

Custom part for https://www.printables.com/fr/model/634289-filament-dry-box-cheap-and-simple I've bought a cheap TPFE coupling kit for 11,99€ on Amazon. It include 10 M10x1 coupling, 10 M6x1 coupling and 5 meters of TPFE tube. Original model use M10x1 coupling and I don't want to waste M6x1 couplings from the kit, so I design a cap nut with M6x1 thread. File “ptfe_nut_10x1mm.stl” is reported by slicing software to have issues. I guess it prints fine, but I redesigned one in the process. Modelled with Freecad, model source file included. Edit 2024/06/14: Addition of ptfe_nut_6x1mm.stl