I designed this simple egg cup as the ones i had bought had been reuined by small people with paints. I used Solidworks to draw this part then revolve extruded the sketched line profile. I then used the shell tool to give a 3mm wall to the part followed by extruded cut of the initials of my child.
The Sunlu PETG used was rated at minimum 230° hotend but i found it printed best at 215° with the Cura base PETG profile. I slightly increased retraction and bed temperature to reduce stringing and prevent warping.
Not tried it in PLA but should be fine