I 3D desingned this model to be print with commun paramethers, it doesnt require horizontal expansion.
It just need supports in certain parts.
The mechanism require 4 bearings of 32mm (there are 3D bearings models that you can print, so you can avoid buying them)
Finally all the pices have holes in order to be easy to assembly them, some of them need glue.
The author marked this model as their own original creation.