The omni wheels are slightly bigger than the regular wheels for some reason. I think they took the diameter of the white part is what they took as 3 inches or something around those lines. The rollers make it slightly bigger than the regular wheels which has caused a problem with my design. I recommend experimenting with placements just to see how things work out.
Marie, I’ve been looking all over for a 4" Omni Wheel model in SolidWorks, and I can’t find them. Is there any way you could post them on 3DCC if you have them on hand? Thanks in advance.