Looking to have a part milled, and the CNC outfit we sent it to had this to say "the part appears to be modeled as more than one component. In order to quote your part we will need the components combined into a single model." This was designed in F360 and exported as a .step file. Any ideas how to solve this? I know when I've had the same part 3D printed, the printers asked if this is supposed to be one piece, as there are several "shells" in the model. I said yes. I assume this same issue is what the CNC outfit is having. Can I turn the entire model into a single component in F360 and solve this?