Did you export all 4 parts differently, because if so they don’t have a center of all 4 they have their own center, you can change their point of origin in roblox studio to center it or you can group them
it’s impossible, there’s no way for me to save exactly the position of the blender’s origin point to put it in roblox studio, I would have to quote a value on the XYZ axis, but there’s no way to know this value
I know how to do this, but I wanted to send the blender directly. Because moving the pivot I wouldn’t know the right value for it to force the center of the circle
Put a tiny plane or cube at 0,0,0 in blender or whatever origin you have, export it to roblox and use it as a primary part, if single vertex meshes are supported in roblox it’d be better to use that.