original model I used: https://grabcad.com/library/ibc-connector-1
With this attachment you can convert your IBC S60 outlet to 32mm PVC pipe. I've connected two tanks together with that. You can use a sealing ring from original tank cap, and some silicone sealing to be sure :)
Creality Ender 3 Pro with Hemera DD extruder
ASA or PETG suggested due to the UV light
No supports necessary, place it “upside-down”
The author hasn't provided the model origin yet.