Printed with supports, it requires a string inserted in each piece to operate as well as 2 3mm screws with nut per joint, the trunk can be as long as you need. It can also be actuated with a motor to roll up the string.
Animation showing the functioning: https://www.youtube.com/watch?v=yorW6011YOo&ab_channel=AlejandroGonz%C3%A1lezEscamilla