Hi sir?i interested with your project,i can help you make 3d modelling from your file autocad,i using solidwork for do it,and i can send format file you needs,i can supplay file for 3d printing machine,as stl file,step,or obj,you can send file your autocad and i'll make 3d modelling,i very happy if can help you for finish this project,i bidding $25 this makesense and minim budjet for 6 modelling, $3,3 for per part,i wait your replay thanks Dedy.e