I drawned this olive oil cap on FreeCAD and I'm very happy with the final result, since my knoledge is very limited on CAD applications.
Printed with PETG because is more flexy than PLA. (Doesn't work with PLA!)
The dimensions are:
-Total length: 82mm
-Base: outer 20mm / inner hole 8.2mm
-Cap/Lid: inner hole 8.2mm