What are the structural design differences between a 3-axis robot arm made out of wood and those in metal or 3D printed plastic we find online?

Pieces will be cut with laser in 2d and assembled and packed in a way to give them the suitable thickness for stiffness. The idea is to build something like the following arm:

EEZYbotARM MK2 by daGHIZmo

submitted by /u/naidala
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