Keeping Kangaroo Simulation Planar?

Hello all,

I've been trying to develop a folding origami pattern using Kangaroo in grasshopper, and while I have the simulation somewhat working, there seems to be floating, and cut geometry. I would like to know how I can keep the simulation running along the XY plane (so that it fold up, not down..) I have attached my work in progress files.

Any help would be greatly appreciated!

Thank you in advance.