The support helps the plant to grow. The central stake is filled with moss and the roots can cling to it.
The Monstera grows faster and can thrive better.
You can find detailed instructions and many other suggestions here:
https://www.instagram.com/plantians.studio/?utm_source=qr&igsh=MWg4aHN4bXdyM2x3Nw%3D%3D
Upadte 2023/04/02
Added separte STL files for all parts.