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You will require;
Smooth ball spring plungers (5mm diameter, 6mm High)x2.
They can be purchased from BamuLab's shop under the maker's supply section for a few dollars, part#FB004. I think they come in a pack of ten. The two ball plungers are inserted into the holes on the hex protrusion of Box B.

No supports are required.
Paper Towel version can be found here:
https://www.printables.com/model/1612977-paper-towel-dispenser

Happy printing.
The author marked this model as their own original creation.