Tevo RX78

These upgrades are the result of several tests.
You can remove eccentric nuts, washers, and spacers.
You'll probably have to blunt some parts to make it perfect, but you will not have to buy anything. No bearings or other parts in my opinion, useless.
The supports for the Z-rod are simple and functional. They must be installed above the mounting plates. The lower support does not require a bearing, because the support base of the Z-rod is a portion of the sphere, which guarantees minimum friction.
The spring boxes are used to prevent the springs from oscillating during the movement of the plate.

You must print:

2 Arm
2 Arm Eccentric
8 Spring Box
1 of all the rest

I added R-Z Base and R-Z Top, which I got from this kit:

https://www.thingiverse.com/thing:1457449

The rod supports z are used for correct alignment.

Once you have found the correct position of the arms, I suggest to drill a hole halfway along the length of the arms and make a corresponding one on th