Hi, I don't have access to a CNC machine but I have a 3D printer. I am trying to decide whether to use aluminum or PLA/ABS to make the frames. Given the CAD files are provided by me, are there any good companies in the USA and Canada that can make the aluminum frames at reasonably price? In case of using a 3D printer to make the frames, is there a good rule of thumb about the thickness of the frames made of ABS or PLA? For example, if an aluminum frame is 3mm, the same frame made of PLA or ABS would require X or Y mm thickness in order to avoid breaking.