Before I started the 3D printing the first robot parts, I discovered three four important things I forgot to add in the CAD. 1. I forgot screw holes to attach the top plate to the chassis! 2. I discovered that the gear on the shark arm was intersecting with the top plate. 3. There should be a wall around the gear inside the chassis to keep wires out of it. While writing this, I realized that I need a slot in the wall to have room for the servo wire.